> There is a python library that recently switched to rust (partially) and now cannot be build on several platforms.

there comes a point where we can't let dependencies on Amiga or DEC Alpha (companies/platforms that haven't existed in literal decades) hold the rest of us back. If someone wants to port rust/llvm to those platforms more power to them, but the rest of us don't need to suffer. The only platform that actually matters that was negatively effected by that change is musl/alpine because there aren't musl wheels available and you have to build the rust part from source.