This doesn't seem surprising for libraries - using new features either means

* doing everything _two_ ways to maintain compatibility with older interpreters

* abandoning compatibility with older interpreters

Dropping support for older versions is a Big Deal. For instance, it's one of the goals on urllib3's v2.0 page (https://urllib3.readthedocs.io/en/stable/v2-roadmap.html#opt...)

If you're a Python developer, do you use the new language features? If not, why do you not use them?