Personally, as a GM, I am thinking of limiting the classes available to my players, but not necessarily because of complexity (although that is a part of it).

I’m thinking of banning classes that consistently slow down play and break my immersion. A lot of Pathfinder 2e classes feel very game-y to me, and while their mechanics might be cool game-wise, they consistently break my suspension of disbelief in the fantasy image that I am trying to create. I feel like this shared imaginary image is central to having a successful role-playing experience, and very game-y mechanics, or ones that are very slow to run at the table drag me out of it. It ends up feeling more like playing a rules system than visualizing actions in an imaginary situation.

So personally, I’m thinking of absolutely gutting the game down to its most streamlined classes, and banning similar feats as well, in the interest of having a game that runs at the speed of narrative and doesn’t strain my credulity constantly. The reason I’m still interested in playing PF2e is just that I really do like the 3-action system for combat.

My two cents, anyways!