You gotta deal with downstream distributors and major users. Linux distros, Apple, Google, AWS, Anaconda, and so many more. Google's using Bazel to build their Python projects, good luck with that one!
You gotta deal with the users and the stans. Wanna know why I stopped working on Python packaging? I got harassed for *months* because KR picked a fight with Reddit right when I dared to include pipenv on http://packaging.python.org. Fuck that.
Go ahead and bookmark this so you can link to it every few months when another baby faced, naive, precious little developer thinks that they can slay the hydra because they only see one head.