One thing that I, as a semi-interested bystander, would like to see is sort of a component of 4. Namely, a document somewhere addressing the question of why I, as a current user of distutils (setup.py, etc), should convert my project to use packaging/distutils2 - and what I'd need to do so.
I’m working on such a document, first in a doc set outside of the Python docs, and when it’s ready as an official HOWTO. (I’ll send the URL when I finish and publish it.)
I checked the docs, and "Distributing Python Modules" is for new projects,
That doc set is for distutils, unless you meant “Distributing Python Projects”, which is currently under severe updating.