> I have to contrast this attitude to CPython, who, while I'm sure they never originally said that their code was designed to run on s390 (risc-v, pick your architecture..), would not go ahead with a change that froze out these users.

You have a wrong recollection of history. CPython removed support for several platforms, including former major ones like Windows XP and Vista.

> Attached PR removes code to support Windows Vista.

https://bugs.python.org/issue32592

And Python 3.9+ doesn't work anymore on Windows 7:

https://discuss.python.org/t/windows-7-support-for-python-3-...