Видели, что пишет CPython Core Developer из Google?
https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html
"Why you shouldn't invoke setup.py directly
[4] Fun fact: adding support for setup.cfg -only packages in v40.9.0 was surprisingly easy because all we needed to do was to generate a temporary setup.py file.
Acknowledgements
Thanks to Bernát Gábor, Filipe Laíns, Jason R Coombs and Jay Faulkner for their comments on early drafts."