Having taken a deep-dive into refactoring a large python app, I can confidently say that package management in python is a pain compared to other interpreted languages.
I don’t know which problem python intended to solve by separating the two, but it doesn’t occur often in contemporary software engineering work.
Having said that, the point you make is valid and Poetry is a good option, but it feels so maddening having to learn about like seven different tools which all do more or less the same but not quite, and everyone and their mother having an opinion on which is the best. Doesn’t help that there’s an arbitrary yet blurry line where package managers end and environment managers begin.
Trying top keep a Pygame/Numpy/Scipy project working has been a real struggle. I started it with Python 2 and ported to Python 3 some years ago. The whole Python 3 transition is a huge mess with every Python 3 point release breaking some things. No other interpreted language’s packaging system is so fucked up.
On a positive note: Lately I've liked using pdm instead of pip, and things seem to work quite a lot better. I evaluated Poetry, Flit and something else also.
I just commented about this on Twitter, when someone asked “Which programming language do you consider beginner's friendly?” https://twitter.com/peterhil/status/1633793218411126789