Likely the reason is that you really only need
just mypy. It handles the type issues. Pylint is useful, but doesn't really overlap with mypy in terms of what it catches, and there's no need to use pyright or to write type-verifying unit tests, or to do runtime type validation if you have mypy.
Using mypy gives you the type safety equivalent of a compiled language. If you're using mypy, you don't need any additional validation that you wouldn't use in java or c++. I didn't downvote you, but the needless defense in depth is weird.
