[sseagull]

This is absolutely how I feel. I've mentioned previously taking over a project, and just not knowing the type of anything took me months to overcome.

Also, type hints really help your IDE, even catching errors before you even run tests.

There's also a visual cue that you are doing something wrong: If a function returns 4 levels of Union[Tuple[List[int]], Optional[str]........ Then you are doing something too complex and the function should be broken up.