When I was first learning and there was a system Python I would install packages, then 6mo to a year later I would find something old. Because the OS came with Python and some number of libraries and because I modified that somehow, I couldn't get back to a known state without reinstalling my OS or updating/removing things likely causing problems. Everything I did were separate test projects, so it never made sense to install libraries globally.

Even now for many languages I shy away from installing globally (I usually install to user if I'm lazy). I feel like in almost any language a "project" (venv) should be taught early on and be simple to use. Basically, the first time you need a third-party module. I feel like newcomers should be shown the REPL, how to save code to a file and run it, standard libraries, then a workspace and how libraries work. Python could be a great example because of the batteries-included model I don't need external libraries for many tasks.