It does seem a case where Microsoft dogfooding GitHub may be actively making it worse. They've done several BUILD and GitHub Universe videos "How Microsoft Uses GitHub to Build [X]" and their PMs certainly need all those complex features to track stuff and those videos are the closest to training materials on how to use some of it, and it is definitely a lot going on.

It definitely seems one of those sorts of "every system PMs touch is doomed to become unmanageable complexity" laws and GitHub "Projects" does seem to be exponentially closer to being "Jira 2: Electric Boogaloo" every day.