The System? Ce Moi!
Okay, joking aside, what can go into making a better ( for whatever version of better you like) GM, when the assumption is effectively that the GM is the system.
Also, once that is hashed out, how do you pass that knowledge on to help new GMs become Good GMs in that mold, rather than making it into some weirdo, mystified, mythified apprenticeship into the HiDDen MYstery CulT (tm)?
I did realize that I still really do like this style of game set up. I just dislike poorly considered, unreflected, undiscussed, and poorly implemented versions of it.