diff --git a/eng/testing/tests.mobile.targets b/eng/testing/tests.mobile.targets
index 1c0ed5772ab653..6480bf85db2eb0 100644
--- a/eng/testing/tests.mobile.targets
+++ b/eng/testing/tests.mobile.targets
@@ -32,7 +32,7 @@
     <NoWarn>$(NoWarn);IL2103;IL2025;IL2111;IL2122</NoWarn>
 
     <!-- Reduce library test app size by trimming framework library features  -->
-    <EnableUnsafeUTF7Encoding Condition="'$(EnableUnsafeUTF7Encoding)' == ''">false</EnableUnsafeUTF7Encoding>
+    <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and '$(Configuration)' != 'Debug'">false</DebuggerSupport>
     <UseSystemResourceKeys Condition="'$(UseSystemResourceKeys)' == ''">false</UseSystemResourceKeys>
   </PropertyGroup>
 
diff --git a/src/mono/msbuild/android/build/AndroidBuild.props b/src/mono/msbuild/android/build/AndroidBuild.props
index 6abfd8adfba125..a2500b478815f9 100644
--- a/src/mono/msbuild/android/build/AndroidBuild.props
+++ b/src/mono/msbuild/android/build/AndroidBuild.props
@@ -52,6 +52,29 @@
     <_CommonTargetsDir Condition="'$(_CommonTargetsDir)' == ''">$([MSBuild]::NormalizeDirectory($(MSBuildThisFileDirectory), '..', '..', 'common'))</_CommonTargetsDir>
   </PropertyGroup>
 
+  <!-- Feature switches defaults, identical to ones in SDK -->
+  <PropertyGroup>
+    <EnableUnsafeUTF7Encoding Condition="'$(EnableUnsafeUTF7Encoding)' == ''">false</EnableUnsafeUTF7Encoding>
+    <EnableUnsafeBinaryFormatterSerialization Condition="'$(EnableUnsafeBinaryFormatterSerialization)' == ''">false</EnableUnsafeBinaryFormatterSerialization>
+    <UseSystemResourceKeys Condition="'$(UseSystemResourceKeys)' == '' and '$(PublishTrimmed)' == 'true'">true</UseSystemResourceKeys>
+    <Http3Support Condition="'$(Http3Support)' == ''">false</Http3Support>
+    <InvariantGlobalization Condition="'$(InvariantGlobalization)' == ''">false</InvariantGlobalization>
+    <StartupHookSupport Condition="'$(StartupHookSupport)' == ''">false</StartupHookSupport>
+    <UseSizeOptimizedLinq Condition="'$(UseSizeOptimizedLinq)' == ''">true</UseSizeOptimizedLinq>
+    <UseNativeHttpHandler Condition="'$(UseNativeHttpHandler)' == ''">false</UseNativeHttpHandler>
+    <BuiltInComInteropSupport Condition="'$(BuiltInComInteropSupport)' == ''">false</BuiltInComInteropSupport>
+    <JsonSerializerIsReflectionEnabledByDefault Condition="'$(JsonSerializerIsReflectionEnabledByDefault)' == '' and '$(TrimMode)' == 'partial'">true</JsonSerializerIsReflectionEnabledByDefault>
+    <!-- Set to disable throwing behavior, see: https://github.com/dotnet/runtime/issues/109724 -->
+    <_DefaultValueAttributeSupport Condition="'$(_DefaultValueAttributeSupport)' == '' and '$(TrimMode)' == 'partial'">true</_DefaultValueAttributeSupport>
+    <AndroidAvoidEmitForPerformance Condition="'$(AndroidAvoidEmitForPerformance)' == ''">$(AvoidEmitForPerformance)</AndroidAvoidEmitForPerformance>
+    <AndroidAvoidEmitForPerformance Condition="'$(AndroidAvoidEmitForPerformance)' == ''">true</AndroidAvoidEmitForPerformance>
+    <!-- Verify DI trimmability at development-time, but turn the validation off for production/trimmed builds. -->
+    <VerifyDependencyInjectionOpenGenericServiceTrimmability Condition="'$(VerifyDependencyInjectionOpenGenericServiceTrimmability)' == '' and '$(PublishTrimmed)' == 'true'">false</VerifyDependencyInjectionOpenGenericServiceTrimmability>
+    <VerifyDependencyInjectionOpenGenericServiceTrimmability Condition="'$(VerifyDependencyInjectionOpenGenericServiceTrimmability)' == ''">true</VerifyDependencyInjectionOpenGenericServiceTrimmability>
+    <EnableSingleFileAnalyzer Condition="'$(EnableSingleFileAnalyzer)' == ''">true</EnableSingleFileAnalyzer>
+    <EnableTrimAnalyzer Condition="'$(EnableTrimAnalyzer)' == '' and '$(TrimMode)' == 'full'">true</EnableTrimAnalyzer>
+  </PropertyGroup>
+
   <Import Condition="'$(UseNativeAOTRuntime)' != 'true' and '$(UseMonoRuntime)' == 'true'" Project="$(_CommonTargetsDir)CommonMobileBuild.props" />
   <Import Condition="'$(UseNativeAOTRuntime)' != 'true' and '$(UseMonoRuntime)' == 'true'" Project="$(_CommonTargetsDir)RuntimeComponentManifest.targets" />
   <Import Condition="'$(UseNativeAOTRuntime)' != 'true' and ('$(UseMonoRuntime)' == 'true' and '$(RunAOTCompilation)' == 'true')" Project="$(_CommonTargetsDir)MonoAOTCompiler.props" />
diff --git a/src/mono/msbuild/apple/build/AppleBuild.props b/src/mono/msbuild/apple/build/AppleBuild.props
index ba3ff16ac72337..6a887375705e8a 100644
--- a/src/mono/msbuild/apple/build/AppleBuild.props
+++ b/src/mono/msbuild/apple/build/AppleBuild.props
@@ -46,6 +46,36 @@
     <_CommonTargetsDir Condition="'$(_CommonTargetsDir)' == ''">$([MSBuild]::NormalizeDirectory($(MSBuildThisFileDirectory), '..', '..', 'common'))</_CommonTargetsDir>
   </PropertyGroup>
 
+  <!-- Feature switches defaults, identical to SDK -->
+  <PropertyGroup>
+		<CustomResourceTypesSupport Condition="'$(CustomResourceTypesSupport)' == ''">false</CustomResourceTypesSupport>
+		<EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization Condition="'$(EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization)' == ''">false</EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization>
+		<EnableUnsafeBinaryFormatterSerialization Condition="'$(EnableUnsafeBinaryFormatterSerialization)' == ''">false</EnableUnsafeBinaryFormatterSerialization>
+		<EnableUnsafeUTF7Encoding Condition="'$(EnableUnsafeUTF7Encoding)' == ''">false</EnableUnsafeUTF7Encoding>
+		<EventSourceSupport Condition="'$(EventSourceSupport)' == '' And '$(Optimize)' == 'true' And '$(EnableDiagnostics)' != 'true'">false</EventSourceSupport>
+		<HttpActivityPropagationSupport Condition="'$(HttpActivityPropagationSupport)' == '' and '$(Optimize)' == 'true'">false</HttpActivityPropagationSupport>
+		<MetricsSupport Condition="'$(MetricsSupport)' == '' And '$(Optimize)' == 'true' And '$(EnableDiagnostics)' != 'true'">false</MetricsSupport>
+		<Http3Support Condition="'$(Http3Support)' == ''">false</Http3Support>
+		<InvariantGlobalization Condition="'$(InvariantGlobalization)' == ''">false</InvariantGlobalization>
+		<!-- Enable HybridGlobalization by default-->
+		<HybridGlobalization Condition="'$(InvariantGlobalization)' != 'true'">true</HybridGlobalization>
+		<StartupHookSupport Condition="'$(StartupHookSupport)' == ''">false</StartupHookSupport>
+		<UseSizeOptimizedLinq Condition="'$(UseSizeOptimizedLinq)' == ''">true</UseSizeOptimizedLinq>
+		<UseSystemResourceKeys Condition="'$(UseSystemResourceKeys)' == ''">false</UseSystemResourceKeys>
+		<UseNativeHttpHandler Condition="'$(UseNativeHttpHandler)' == ''">false</UseNativeHttpHandler>
+		<!-- AutoreleasePoolSupport needs to be set earlier, so that illink doesn't override it - https://github.com/dotnet/runtime/pull/86753 - so it's set in Xamarin.Shared.Sdk.props -->
+		<EnableCppCLIHostActivation Condition="'$(EnableCppCLIHostActivation)' == ''">false</EnableCppCLIHostActivation>
+		<_EnableConsumingManagedCodeFromNativeHosting Condition="'$(_EnableConsumingManagedCodeFromNativeHosting)' == ''">false</_EnableConsumingManagedCodeFromNativeHosting>
+		<NullabilityInfoContextSupport Condition="'$(NullabilityInfoContextSupport)' == ''">false</NullabilityInfoContextSupport>
+		<BuiltInComInteropSupport Condition="'$(BuiltInComInteropSupport)' == ''">false</BuiltInComInteropSupport>
+		<!-- Verify DI trimmability at development-time, but turn the validation off for production/trimmed builds. -->
+		<VerifyDependencyInjectionOpenGenericServiceTrimmability Condition="'$(VerifyDependencyInjectionOpenGenericServiceTrimmability)' == '' And '$(_BundlerDebug)' != 'true'">false</VerifyDependencyInjectionOpenGenericServiceTrimmability>
+		<VerifyDependencyInjectionOpenGenericServiceTrimmability Condition="'$(VerifyDependencyInjectionOpenGenericServiceTrimmability)' == ''">true</VerifyDependencyInjectionOpenGenericServiceTrimmability>
+		<!-- This should be set by dotnet/sdk instead, once https://github.com/dotnet/sdk/issues/25392 gets resolved.  -->
+		<DynamicCodeSupport Condition="'$(DynamicCodeSupport)' == '' And ( '$(MtouchInterpreter)' == '' And '$(UseInterpreter)' != 'true' ) And ('$(_PlatformName)' == 'iOS' Or '$(_PlatformName)' == 'tvOS' Or '$(_PlatformName)' == 'MacCatalyst')">false</DynamicCodeSupport>
+		<_ComObjectDescriptorSupport Condition="'$(_ComObjectDescriptorSupport)' == ''">false</_ComObjectDescriptorSupport>
+  </PropertyGroup>
+
   <Import Condition="'$(UseNativeAOTRuntime)' != 'true' and '$(UseMonoRuntime)' != 'false'" Project="$(_CommonTargetsDir)CommonMobileBuild.props" />
   <Import Condition="'$(UseNativeAOTRuntime)' != 'true' and '$(UseMonoRuntime)' != 'false'" Project="$(_CommonTargetsDir)RuntimeComponentManifest.targets" />
   <Import Condition="'$(UseNativeAOTRuntime)' != 'true' and ('$(UseMonoRuntime)' != 'false' and '$(RunAOTCompilation)' == 'true')" Project="$(_CommonTargetsDir)MonoAOTCompiler.props" />