That’s a good point. My intent is that the core devs continue to make decisions over such changes to typing.py, because I don’t see a reason to change the status quo there, but the Typing Council should also consider these use cases and provide feedback if necessary. I pushed a change to the PEP draft to reflect that: https://github.com/python/peps/pull/3455/commits/ca317b7ec38f07f7e71d420fdb4be124443078d2