I do not know what you are objecting to. I have successfully packaged wheels for MacOS and Ubuntu with manylinux. I presume it works with some others too, but that is what I can personally attest to. Alpine is catered to by the musllinux project.
You should be specific about which distributions you have in mind.
So, you're doubling down on OP's misnomer of "cross platform means whatever platforms I use", eh?