I mean it's completely optional. Even if you are to use python as a glue language, with absolutely 0 typing annotations on your side, it's still very very usefu

I mean it's completely optional. Even if you are to use python as a glue language, with absolutely 0 typing annotations on your side, it's still very very useful to have them in the libraries that you inevitably end up using with python. It's not even like it requires an additional build step, so it's really just free.