Then we layered _another_ level of package management on top with Flatpak etc.
I don’t think anyone has _really_ been - in practice - able to understand how many versions of Python (or shells or ruby or Perl etc…) are installed on any system for a decade or two now.
[Edit to add: and I forgot entirely about venvs (and other language’s equivalents). We put package managers into packages! Now there can be a different version of every package for every script on your system. In every container. And Python even has more than one venv system to choose from!]
[Yes, I use all these things - it’s so hard _not_ to and still use modern software or participate in modern software development…]