Players like to talk about their PCs being some form of therapy or figuring some stuff out or reveling in some aspect of yourself, but I rarely hear of the opposite.
With so many NPCs on display, sure there's bound to be some that follow the "facet of myself" type deal, but I never hear much about gming through stuff.
Maybe the inherent power dynamic makes it touchier, since you're now subjecting multiple people to your whole ordeal. Sure another player might do that, but they don't have the reins on the game's flow in the same way.
Maybe it is a thing and I'm just not in the circles to have seen it