The first group and approach offers very, very little to the faculty of everyone who is not a savant. I think this explains why D&D culture has been plagued by such a dearth of GMs (in proportion to its user base) and such a disproportionate amount of crap GMs; because this Master : Padawan relationship was how the craft was passed down historically (and, simply, it didn’t work at scale and created an enormous amount of discontent). So therefore demystifying the process so that people can actually learn it is how we get better (at large) as a culture of craftsfolk.
TLDR - GMs aren't Jedis and the only Force they wield is the kind that wrests the trajectory of play from the players/system to themselves...and acting like they are Jedis has made our hobby worse than it could be (because it doesn't produce capable Gamesmasters at scale).