I think @kngharv’s point was more about the inability to easily uninstall things later, bloating your system more and more with time.
Where This page has moved - pip documentation v23.3.2 could probably help.
But you have to remember all of that you have installed and by which installer.
For pip it’s This page has moved - pip documentation v23.3.2 but there is no single command that lists all you packages installed with all kinds of installers. 