As someone who writes Python 9 to 5, I much rather be writing Rust (which I do in my spare time) and would concur that Python generally sucks to write large code bases [0].

That being said, I really don't think any of the reasons here get to why python isn't fun to write large code bases in. I'd say my biggest pain point has more to do with it's typing system (which is getting better).

[0] Can it be done properly? Sure. But I personally feel worse about python the more complex a library I'm writing gets.