> The root cause: Google’s new aapt2 binary in AGP 8.12.0 started requiring CPU instructions (SSE4.1, SSSE3) that F-Droid’s build farm hardware doesn’t support.

Very intelligent move from Google. Now you can't compile "Hello World" without SSE4.1, SSSE3. /s

Are there any X86 tablets with Android ?

There are very few 17+ years old build servers at this point. Or laptops and desktops for that matter.