Do you mean that the hierarchies don't tend to be very deep in Python? I don't tend to have deep inheritance hierarchies in Python, but I don't tend to have that in really any language I use. If you mean Python code doesn't tend to use inheritance in general, I'm not sure that's true. Django, DRF, the ML/DS packages, etc. all seem to use inheritance as much as any other language...I think? Maybe you're contrasting to those endlessly deep hierarchies you might find in Java? Otherwise, I'm just not sure what the basis is for saying you shouldn't rely on inheritance in Python, given that it is a first-class citizen due to its object-oriented programming model.
In a lot of cases it is necessary complexity, between overloading the dot operator, wrapping SQL, and supporting multiple database backends. There is a fair bit of bloat, though.
