OP keeps bringing up the Pitt game and blaming the coaching staff. The same coaching staff put up 50 against Pitt the year prior. It's amazing how much better an offense can be if you can complete a forward pass.
Everyone wants these dynamic offenses with full route trees and well executed zone blocking. The thing is, it ain't madden. When you aren't comfortable with your QB's ability to complete certain types of passes on certain routes, you can't call those plays or incorporate those concepts. When your offensive line can't execute a basic inside zone run, how are you going to expect them to handle more complicated assignments.
Some of that is on the coaches but in fairness to them, they inherited a QB who wouldn't start for FAU and the rest of the quarterbacks on the roster were freshmen who were clearly not ready to come in and start for a P5 program. They did the best they could with the cards they were dealt in that regard. I have less sympathy for coach Searles who inherited an experienced offensive line and could not even turn them into an average unit.
Richt and Brown aren't running a simplistic and sometimes predictable offense because they want to, It's because they have to.