Yeah, really interested to know why ?

It is too loose typed and it's implementation of interfaces is too relaxed to use complex software engineering patterns and methodologies like DDD and SOLID.

> it's implementation of interfaces is too relaxed

as someone only casually used to python im curious how so?

It only has duck-typed interfaces, unable to verify methods' signatures. Trying to implement strong inheritance leads to monstrosities __instancecheck__ and __subclasscheck__ and manual type checking of injected dependencies.