It might be in the nature of what I work on. If I don’t know what arguments a method or a function takes I go and read its source. It is usually very quick and obvious to figure out if it’s a simple type: int, dict, list, float, string, etc. If it isn’t, type hints won’t save you:

    charge_customer(order_details: dict)

That fact that it’s a dict is the least of my worries. I need to know what goes into it, for which I need to either read the docs or the code. So you try to organize it more and avoid using something like a dict of order details. Instead you create an order object that has methods like add_item(id, qty). Can you guess what those are or deduce it quickly by looking at docs or the implementation of the method? Most likely. I’m not saying that type hints won’t help. But as far as just type checking at compile time they only really work as a very obtuse tool, and at runtime they are a very feature-barren form of contracts.

Python has doctests.