I agree that talking about processes helps some, but I think that principles matter at least as much from a GMing standpoint as game mechanics. I know there are some in this thread who prefer to consider games as they are published--so the principles of play in, e.g., BitD, don't apply to D&D, even if a given DM is importing things.
@Ovinomancer said elsewhere, IIRC, that he runs D&D 5E with much more of the mechanical bits player-facing (announced DC, public rolls, maybe other things) but when he talks about D&D 5E,
the game, he's talking about what's in the books. That's fine, when one is talking about what's in the books; but I think it's fair to think of it as incomplete if someone who runs 5E is looking for ways to increase player engagement (since I think one can grab tricks or principles from other games and apply them to 5E to great effect).
I can see this. Of course, I'm not sure many of the instances of bad GMing I've seen discussed have been exactly degenerate--there have been systems published that seemed almost intended to generate what many would describe as "bad GMing" if played according to what was in the books.
Yeah. I think intentionally bad (abusive) GMs are ... less common than some people seem to think, but more common than I think most people would prefer. I think unintentionally bad GMs are much more common, and led astray by the games they're running (or by games they've run, and now they're applying those lessons to other games).