Hynek, a CPython committer, had written a blog post[1] the state of Python application dependencies in 2018, updated in 2019 (no change in 2020, I asked). It was also surfaced on HN 3 times but did not get much attention[2]

[1]: https://hynek.me/articles/python-app-deps-2018/#petry

[2]: https://hn.algolia.com/?q=python-app-deps-2018