[copergi]

>"hard to explain" or "easy to obfuscate."

I wouldn't call it either of those things. They are so general that people have a hard time getting them. That's all.

>That's what the "mumble mumble endofunctors" joke is getting at: sometimes they're a useful generalization, but more often they're a way to make easy things sound hard, or to make bad teachers sound smart.

That is not at all what the joke is getting at (and that doesn't even make sense).