diff --git a/launcher/Application.cpp b/launcher/Application.cpp
index 622f688e6..f6f2b0486 100644
--- a/launcher/Application.cpp
+++ b/launcher/Application.cpp
@@ -130,7 +130,7 @@
 
 #ifdef Q_OS_LINUX
 #include <dlfcn.h>
-#include "MangoHud.h"
+#include "LibraryUtils.h"
 #include "gamemode_client.h"
 #endif
 
@@ -1834,7 +1834,7 @@ void Application::updateCapabilities()
     if (gamemode_query_status() >= 0)
         m_capabilities |= SupportsGameMode;
 
-    if (!MangoHud::getLibraryString().isEmpty())
+    if (!LibraryUtils::findMangoHud().isEmpty())
         m_capabilities |= SupportsMangoHud;
 #endif
 }
@@ -1842,8 +1842,8 @@ void Application::updateCapabilities()
 void Application::detectLibraries()
 {
 #ifdef Q_OS_LINUX
-    m_detectedGLFWPath = MangoHud::findLibrary(BuildConfig.GLFW_LIBRARY_NAME);
-    m_detectedOpenALPath = MangoHud::findLibrary(BuildConfig.OPENAL_LIBRARY_NAME);
+    m_detectedGLFWPath = LibraryUtils::find(BuildConfig.GLFW_LIBRARY_NAME);
+    m_detectedOpenALPath = LibraryUtils::find(BuildConfig.OPENAL_LIBRARY_NAME);
     qDebug() << "Detected native libraries:" << m_detectedGLFWPath << m_detectedOpenALPath;
 #endif
 }
diff --git a/launcher/Application.h b/launcher/Application.h
index 563597935..1b483612d 100644
--- a/launcher/Application.h
+++ b/launcher/Application.h
@@ -97,7 +97,6 @@ class Index;
 #define APPLICATION_DYN (dynamic_cast<Application*>(QCoreApplication::instance()))
 
 class Application : public QApplication {
-    // friends for the purpose of limiting access to deprecated stuff
     Q_OBJECT
    public:
     enum Status { StartingUp, Failed, Succeeded, Initialized };
diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index 361baa26d..dbbe9e85d 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -75,9 +75,6 @@ set(CORE_SOURCES
     # RW lock protected map
     RWStorage.h
 
-    # A variable that has an implicit default value and keeps track of changes
-    DefaultVariable.h
-
     # a smart pointer wrapper intended for safer use with Qt signal/slot mechanisms
     QObjectPtr.h
 
@@ -110,9 +107,9 @@ if (UNIX AND NOT CYGWIN AND NOT APPLE)
     set(CORE_SOURCES
     ${CORE_SOURCES}
 
-    # MangoHud
-    MangoHud.h
-    MangoHud.cpp
+    # LibraryUtils
+    LibraryUtils.h
+    LibraryUtils.cpp
     )
 endif()
 
diff --git a/launcher/DefaultVariable.h b/launcher/DefaultVariable.h
deleted file mode 100644
index b082091c7..000000000
--- a/launcher/DefaultVariable.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#pragma once
-
-template <typename T>
-class DefaultVariable {
-   public:
-    DefaultVariable(const T& value) { defaultValue = value; }
-    DefaultVariable<T>& operator=(const T& value)
-    {
-        currentValue = value;
-        is_default = currentValue == defaultValue;
-        is_explicit = true;
-        return *this;
-    }
-    operator const T&() const { return is_default ? defaultValue : currentValue; }
-    bool isDefault() const { return is_default; }
-    bool isExplicit() const { return is_explicit; }
-
-   private:
-    T currentValue;
-    T defaultValue;
-    bool is_default = true;
-    bool is_explicit = false;
-};
diff --git a/launcher/MangoHud.cpp b/launcher/LibraryUtils.cpp
similarity index 94%
rename from launcher/MangoHud.cpp
rename to launcher/LibraryUtils.cpp
index d85100207..4ac038114 100644
--- a/launcher/MangoHud.cpp
+++ b/launcher/LibraryUtils.cpp
@@ -25,7 +25,7 @@
 
 #include "FileSystem.h"
 #include "Json.h"
-#include "MangoHud.h"
+#include "LibraryUtils.h"
 
 #ifdef __GLIBC__
 #ifndef _GNU_SOURCE
@@ -36,9 +36,9 @@
 #include <linux/limits.h>
 #endif
 
-namespace MangoHud {
+namespace LibraryUtils {
 
-QString getLibraryString()
+QString findMangoHud()
 {
     /**
      * Guess MangoHud install location by searching for vulkan layers in this order:
@@ -123,7 +123,7 @@ QString getLibraryString()
 
 #ifdef __GLIBC__
             // Check whether mangohud is usable on a glibc based system
-            QString libraryPath = findLibrary(libraryName);
+            QString libraryPath = find(libraryName);
             if (!libraryPath.isEmpty()) {
                 return libraryPath;
             }
@@ -138,7 +138,7 @@ QString getLibraryString()
     return {};
 }
 
-QString findLibrary(QString libName)
+QString find(QString libName)
 {
 #ifdef __GLIBC__
     const char* library = libName.toLocal8Bit().constData();
@@ -161,11 +161,11 @@ QString findLibrary(QString libName)
     dlclose(handle);
     return fullPath;
 #else
-    qWarning() << "MangoHud::findLibrary is not implemented on this platform";
+    qWarning() << "LibraryUtils::find is not implemented on this platform";
     return {};
 #endif
 }
-}  // namespace MangoHud
+}  // namespace LibraryUtils
 
 #ifdef UNDEF_GNU_SOURCE
 #undef _GNU_SOURCE
diff --git a/launcher/MangoHud.h b/launcher/LibraryUtils.h
similarity index 87%
rename from launcher/MangoHud.h
rename to launcher/LibraryUtils.h
index 5361999b4..6832a9627 100644
--- a/launcher/MangoHud.h
+++ b/launcher/LibraryUtils.h
@@ -21,9 +21,9 @@
 #include <QString>
 #include <QStringList>
 
-namespace MangoHud {
+namespace LibraryUtils {
 
-QString getLibraryString();
+QString findMangoHud();
 
-QString findLibrary(QString libName);
-}  // namespace MangoHud
+QString find(QString libName);
+}  // namespace LibraryUtils
diff --git a/launcher/PSaveFile.h b/launcher/PSaveFile.h
index 67a57a1a2..533195e94 100644
--- a/launcher/PSaveFile.h
+++ b/launcher/PSaveFile.h
@@ -67,5 +67,5 @@ class PSaveFile : public QSaveFile {
     QString m_absoluteFilePath;
 };
 #else
-#define PSaveFile QSaveFile
+using PSaveFile = QSaveFile;
 #endif
diff --git a/launcher/filelink/FileLink.h b/launcher/filelink/FileLink.h
index b767f7f74..25fdb71fc 100644
--- a/launcher/filelink/FileLink.h
+++ b/launcher/filelink/FileLink.h
@@ -38,7 +38,6 @@
 #include "FileSystem.h"
 
 class FileLinkApp : public QCoreApplication {
-    // friends for the purpose of limiting access to deprecated stuff
     Q_OBJECT
    public:
     enum Status { Starting, Failed, Succeeded, Initialized };
diff --git a/launcher/minecraft/Agent.h b/launcher/minecraft/Agent.h
index bc385a74e..2432679da 100644
--- a/launcher/minecraft/Agent.h
+++ b/launcher/minecraft/Agent.h
@@ -4,26 +4,10 @@
 
 #include "Library.h"
 
-class Agent;
-
-using AgentPtr = std::shared_ptr<Agent>;
-
-class Agent {
-   public:
-    Agent(LibraryPtr library, const QString& argument)
-    {
-        m_library = library;
-        m_argument = argument;
-    }
-
-   public: /* methods */
-    LibraryPtr library() { return m_library; }
-    QString argument() { return m_argument; }
-
-   protected: /* data */
+struct Agent {
     /// The library pointing to the jar this Java agent is contained within
-    LibraryPtr m_library;
+    LibraryPtr library;
 
     /// The argument to the Java agent, passed after an = if present
-    QString m_argument;
+    QString argument;
 };
diff --git a/launcher/minecraft/GradleSpecifier.h b/launcher/minecraft/GradleSpecifier.h
index a2588064f..65297abed 100644
--- a/launcher/minecraft/GradleSpecifier.h
+++ b/launcher/minecraft/GradleSpecifier.h
@@ -38,12 +38,10 @@
 #include <QRegularExpression>
 #include <QString>
 #include <QStringList>
-#include "DefaultVariable.h"
 
 struct GradleSpecifier {
     GradleSpecifier() { m_valid = false; }
-    GradleSpecifier(QString value) { operator=(value); }
-    GradleSpecifier& operator=(const QString& value)
+    GradleSpecifier(const QString& value)
     {
         /*
         org.gradle.test.classifiers : service : 1.0 : jdk15 @ jar
@@ -62,7 +60,7 @@ struct GradleSpecifier {
         m_valid = match.hasMatch();
         if (!m_valid) {
             m_invalidValue = value;
-            return *this;
+            return;
         }
         auto elements = match.captured();
         m_groupId = match.captured(1);
@@ -72,7 +70,6 @@ struct GradleSpecifier {
         if (match.lastCapturedIndex() >= 5) {
             m_extension = match.captured(5);
         }
-        return *this;
     }
     QString serialize() const
     {
@@ -83,8 +80,8 @@ struct GradleSpecifier {
         if (!m_classifier.isEmpty()) {
             retval += ":" + m_classifier;
         }
-        if (m_extension.isExplicit()) {
-            retval += "@" + m_extension;
+        if (m_extension.has_value()) {
+            retval += "@" + m_extension.value();
         }
         return retval;
     }
@@ -97,7 +94,7 @@ struct GradleSpecifier {
         if (!m_classifier.isEmpty()) {
             filename += "-" + m_classifier;
         }
-        filename += "." + m_extension;
+        filename += "." + m_extension.value_or("jar");
         return filename;
     }
     QString toPath(const QString& filenameOverride = QString()) const
@@ -122,26 +119,13 @@ struct GradleSpecifier {
     inline QString artifactId() const { return m_artifactId; }
     inline void setClassifier(const QString& classifier) { m_classifier = classifier; }
     inline QString classifier() const { return m_classifier; }
-    inline QString extension() const { return m_extension; }
+    inline std::optional<QString> extension() const { return m_extension; }
     inline QString artifactPrefix() const { return m_groupId + ":" + m_artifactId; }
     bool matchName(const GradleSpecifier& other) const
     {
         return other.artifactId() == artifactId() && other.groupId() == groupId() && other.classifier() == classifier();
     }
-    bool operator==(const GradleSpecifier& other) const
-    {
-        if (m_groupId != other.m_groupId)
-            return false;
-        if (m_artifactId != other.m_artifactId)
-            return false;
-        if (m_version != other.m_version)
-            return false;
-        if (m_classifier != other.m_classifier)
-            return false;
-        if (m_extension != other.m_extension)
-            return false;
-        return true;
-    }
+    bool operator ==(const GradleSpecifier &other) const = default;
 
    private:
     QString m_invalidValue;
@@ -149,6 +133,6 @@ struct GradleSpecifier {
     QString m_artifactId;
     QString m_version;
     QString m_classifier;
-    DefaultVariable<QString> m_extension = DefaultVariable<QString>("jar");
+    std::optional<QString> m_extension;
     bool m_valid = false;
 };
diff --git a/launcher/minecraft/LaunchProfile.cpp b/launcher/minecraft/LaunchProfile.cpp
index c11a0f915..577b8581c 100644
--- a/launcher/minecraft/LaunchProfile.cpp
+++ b/launcher/minecraft/LaunchProfile.cpp
@@ -213,9 +213,9 @@ void LaunchProfile::applyMavenFile(LibraryPtr mavenFile, const RuntimeContext& r
     m_mavenFiles.append(Library::limitedCopy(mavenFile));
 }
 
-void LaunchProfile::applyAgent(AgentPtr agent, const RuntimeContext& runtimeContext)
+void LaunchProfile::applyAgent(const Agent& agent, const RuntimeContext& runtimeContext)
 {
-    auto lib = agent->library();
+    auto lib = agent.library;
     if (!lib->isActive(runtimeContext)) {
         return;
     }
@@ -330,7 +330,7 @@ const QList<LibraryPtr>& LaunchProfile::getMavenFiles() const
     return m_mavenFiles;
 }
 
-const QList<AgentPtr>& LaunchProfile::getAgents() const
+const QList<Agent>& LaunchProfile::getAgents() const
 {
     return m_agents;
 }
diff --git a/launcher/minecraft/LaunchProfile.h b/launcher/minecraft/LaunchProfile.h
index f1be6fee0..0d2d97c45 100644
--- a/launcher/minecraft/LaunchProfile.h
+++ b/launcher/minecraft/LaunchProfile.h
@@ -57,7 +57,7 @@ class LaunchProfile : public ProblemProvider {
     void applyMods(const QList<LibraryPtr>& jarMods);
     void applyLibrary(LibraryPtr library, const RuntimeContext& runtimeContext);
     void applyMavenFile(LibraryPtr library, const RuntimeContext& runtimeContext);
-    void applyAgent(AgentPtr agent, const RuntimeContext& runtimeContext);
+    void applyAgent(const Agent& agent, const RuntimeContext& runtimeContext);
     void applyCompatibleJavaMajors(QList<int>& javaMajor);
     void applyCompatibleJavaName(QString javaName);
     void applyMainJar(LibraryPtr jar);
@@ -79,7 +79,7 @@ class LaunchProfile : public ProblemProvider {
     const QList<LibraryPtr>& getLibraries() const;
     const QList<LibraryPtr>& getNativeLibraries() const;
     const QList<LibraryPtr>& getMavenFiles() const;
-    const QList<AgentPtr>& getAgents() const;
+    const QList<Agent>& getAgents() const;
     const QList<int>& getCompatibleJavaMajors() const;
     const QString getCompatibleJavaName() const;
     const LibraryPtr getMainJar() const;
@@ -132,7 +132,7 @@ class LaunchProfile : public ProblemProvider {
     QList<LibraryPtr> m_mavenFiles;
 
     /// the list of java agents to add to JVM arguments
-    QList<AgentPtr> m_agents;
+    QList<Agent> m_agents;
 
     /// the main jar
     LibraryPtr m_mainJar;
diff --git a/launcher/minecraft/MinecraftInstance.cpp b/launcher/minecraft/MinecraftInstance.cpp
index 8ec928ec9..7c246f587 100644
--- a/launcher/minecraft/MinecraftInstance.cpp
+++ b/launcher/minecraft/MinecraftInstance.cpp
@@ -97,7 +97,7 @@
 #include <QWindow>
 
 #ifdef Q_OS_LINUX
-#include "MangoHud.h"
+#include "LibraryUtils.h"
 #endif
 
 #ifdef WITH_QTDBUS
@@ -529,10 +529,10 @@ QStringList MinecraftInstance::extraArguments()
         }
     }
     auto agents = m_components->getProfile()->getAgents();
-    for (auto agent : agents) {
+    for (const auto& agent : agents) {
         QStringList jar, temp1, temp2, temp3;
-        agent->library()->getApplicableFiles(runtimeContext(), jar, temp1, temp2, temp3, getLocalLibraryPath());
-        list.append("-javaagent:" + jar[0] + (agent->argument().isEmpty() ? "" : "=" + agent->argument()));
+        agent.library->getApplicableFiles(runtimeContext(), jar, temp1, temp2, temp3, getLocalLibraryPath());
+        list.append("-javaagent:" + jar[0] + (agent.argument.isEmpty() ? "" : "=" + agent.argument));
     }
 
     {
@@ -700,7 +700,7 @@ QProcessEnvironment MinecraftInstance::createLaunchEnvironment()
         if (auto value = env.value("LD_PRELOAD"); !value.isEmpty())
             preloadList = value.split(QLatin1String(":"));
 
-        auto mangoHudLibString = MangoHud::getLibraryString();
+        auto mangoHudLibString = LibraryUtils::findMangoHud();
         if (!mangoHudLibString.isEmpty()) {
             QFileInfo mangoHudLib(mangoHudLibString);
             QString libPath = mangoHudLib.absolutePath();
diff --git a/launcher/minecraft/OneSixVersionFormat.cpp b/launcher/minecraft/OneSixVersionFormat.cpp
index 34a212f20..95f4c5ef6 100644
--- a/launcher/minecraft/OneSixVersionFormat.cpp
+++ b/launcher/minecraft/OneSixVersionFormat.cpp
@@ -209,8 +209,7 @@ VersionFilePtr OneSixVersionFormat::versionFileFromJson(const QJsonDocument& doc
             QString arg = "";
             readString(agentObj, "argument", arg);
 
-            AgentPtr agent(new Agent(lib, arg));
-            out->agents.append(agent);
+            out->agents.append(Agent{ lib, arg });
         }
     }
 
@@ -305,10 +304,10 @@ QJsonDocument OneSixVersionFormat::versionFileToJson(const VersionFilePtr& patch
     writeStringList(root, "+jvmArgs", patch->addnJvmArguments);
     if (!patch->agents.isEmpty()) {
         QJsonArray array;
-        for (auto value : patch->agents) {
-            QJsonObject agentOut = OneSixVersionFormat::libraryToJson(value->library().get());
-            if (!value->argument().isEmpty())
-                agentOut.insert("argument", value->argument());
+        for (const auto& value : patch->agents) {
+            QJsonObject agentOut = OneSixVersionFormat::libraryToJson(value.library.get());
+            if (!value.argument.isEmpty())
+                agentOut.insert("argument", value.argument);
 
             array.append(agentOut);
         }
diff --git a/launcher/minecraft/PackProfile.cpp b/launcher/minecraft/PackProfile.cpp
index 7ffebddb5..72e1207ab 100644
--- a/launcher/minecraft/PackProfile.cpp
+++ b/launcher/minecraft/PackProfile.cpp
@@ -917,7 +917,7 @@ bool PackProfile::installAgents_internal(QStringList filepaths)
         agent->setDisplayName(sourceInfo.completeBaseName());
         agent->setHint("local");
 
-        versionFile->agents.append(std::make_shared<Agent>(agent, QString()));
+        versionFile->agents.append(Agent{agent, QString()});
 
         versionFile->name = targetName;
         versionFile->uid = targetId;
diff --git a/launcher/minecraft/VersionFile.h b/launcher/minecraft/VersionFile.h
index 40f49aaa4..32a7504ac 100644
--- a/launcher/minecraft/VersionFile.h
+++ b/launcher/minecraft/VersionFile.h
@@ -126,7 +126,7 @@ class VersionFile : public ProblemContainer {
     QList<LibraryPtr> mavenFiles;
 
     /// Prism Launcher: list of agents to add to JVM arguments
-    QList<AgentPtr> agents;
+    QList<Agent> agents;
 
     /// The main jar (Minecraft version library, normally)
     LibraryPtr mainJar;
diff --git a/launcher/minecraft/update/LibrariesTask.cpp b/launcher/minecraft/update/LibrariesTask.cpp
index c09be2156..f725af18d 100644
--- a/launcher/minecraft/update/LibrariesTask.cpp
+++ b/launcher/minecraft/update/LibrariesTask.cpp
@@ -44,8 +44,8 @@ void LibrariesTask::executeTask()
     libArtifactPool.append(profile->getLibraries());
     libArtifactPool.append(profile->getNativeLibraries());
     libArtifactPool.append(profile->getMavenFiles());
-    for (auto agent : profile->getAgents()) {
-        libArtifactPool.append(agent->library());
+    for (const auto& agent : profile->getAgents()) {
+        libArtifactPool.append(agent.library);
     }
     libArtifactPool.append(profile->getMainJar());
     processArtifactPool(libArtifactPool, failedLocalLibraries, inst->getLocalLibraryPath());
diff --git a/launcher/updater/prismupdater/PrismUpdater.h b/launcher/updater/prismupdater/PrismUpdater.h
index f141b6c7d..5f4baec64 100644
--- a/launcher/updater/prismupdater/PrismUpdater.h
+++ b/launcher/updater/prismupdater/PrismUpdater.h
@@ -46,7 +46,6 @@
 #include "GitHubRelease.h"
 
 class PrismUpdaterApp : public QApplication {
-    // friends for the purpose of limiting access to deprecated stuff
     Q_OBJECT
    public:
     enum Status { Starting, Failed, Succeeded, Initialized, Aborted };