Where you take your licks is psychologically. Then there are the times when the pocket never even forms. It can be demoralizing. It can send you down the pipes. Teammates start pointing fingers.
Quarterbacks fall to phantom contact.
Normally diligent offensive tackles forget the snap count. And the modern NFL puts more pressure than ever on pass blockers. In the last fifteen or twenty years, the passing attack has become more prevalent. So the rush is even more important. Many of the best are now linebackers, a trend that began in the 70s and was taken to an art form by Lawrence Taylor in the 80s.