I think some of the the bitching is how we have lost several very close games, games in which we feel we could have won had we opened up a the offensive playbook just a bit--had we included more of our playmakers in the offense rather than using them primarily as blockers and decoys. Had we not been so stubbornly predictable. Had we not run play after play into stacked boxes when our announced philosophy is to "take what the defense gives us." Had we not essentially forfeited most of the realistic potential for explosive plays when our coach numbers explosive plays as one of the key ways, statistically, that teams win football games.
People's bitching about our manner of winning close games is secondary. It is the "use it or lose it" comment. If we abandon entire parts of the offense in winning efforts (thankfully the majority of games), we deprive those parts of valuable game experience and emotional involvement as key playmakers (which is very different than in practice)--we don't develop them. Some believe it is more difficult for those underused offensive elements to suddenly come alive and communicate well and have their timing down on precision passing plays when, suddenly, in a "behind" situation, they are called upon to shake off the rust and save the day.