It's so ridiculous that many projects don't even support pip+venv (much less system python packages. shivers). They literally check if that's what you're trying and pre-emptively fail.

Some projects become impossible to run in any combination because some dependency (looking at you, sentencepiece) no longer works outside a narrow set of circumstances, unless you hand build some obscure github PR, disable all the dependency checks and cross your fingers and hope the wheel builds.

And I'm sorry, but I don't have 200GB of space, tons of spare RAM, and an intricate docker passthrough setup for every random python project. I just have like four different 3rd party managers (conda/mamba, uv, poetry... what's the other one? Ugh)