dotnet publish/build still adds x86_x64 runtime by default

[danardelean]

Android framework version

net10.0-android (Preview)

Affected platform version

All

Description

I am really struggling to understand why, after years, when building an .Net Android application in Release you are still adding by default the x86_x64 runtime.

It really doesn't make any sense... If somebody wants to test the package on a simulator it can manually add the runtime.
Why waste space and bandwidth if there are no devices that use x86_x64 out there (or if there are they can add it manually)

Steps to Reproduce

Just build any .Net Android or MAUI application in release and look inside the package

Did you find any workaround?

Remove x86_x64 as default when building in Release

Relevant log output

[hez2010]

I believe including both x86_64 and aarch64 binaries in a universal package is recommended by Google.
Besides Android, there is also ChromeOS that runs your Android app on x86_64.
If you don't want the x86_64 one, you can specify the runtime identifier like <RuntimeIdentifier>android-arm64<RuntimeIdentifier> manually in the project file.

[danardelean]

I think ChromeOS is the exception here. Whoever wants to run the application on ChromeOS on x86_64 can add it after. The difference with the "native" approach is that for every architecture we have the .Net runtime compiled for that architecture added inside the package and when using AOT things get worst because you will have all the assemblies multiplied by the number of architectures included in the apk (when using aab is a different story as, I think, it will download a package tailored for the cpu architecture it will run on).
If you want to compare on how it works default for a Kotlin/Java project on Android you will see that in release you have all the architectures: arm64-v8a, armeabi-v7a, x86 and x86_64

[jonathanpeppers]

I think having the two 64 bit architectures is a sensible default. By default Release builds should be able to run on emulators. At minimum we'd have 100s of failing unit tests if we made this change.

If you want to change it for your project, what is preventing you from just putting <RuntimeIdentifier>android-arm64</RuntimeIdentifier> in your project?