[fock]

Yes, I agree on that, spack can lock everything except the kernel and libc.

I also don't think this is a failure of "python" as some others have raised that in the vincinity. Managing binaries is just out-of-scope and should be left to another tool - such as given with pyenv. It's solving this problem in a narrow way, which most commenters find confusing and I find a bit useless compared to alternatives!