Winning the special teams aspect of the game is so underrated. For T.O.'s entire career (to my memory), we almost always won the special teams battle. Over the course of a game, it is very, very key to ultimately winning or losing that game.
Obviously other areas of the game are very key also - like consistently winning/controlling the LOS and being at least even or on the right side of turnovers. Do those 3 things - win LOS, be even or win the turnover battle and be even or usually win special teams, and I bet those 3 things alone would lead to a 60 to 70% win percentage. Of course, winning those phases of the game means you likely have good or great players executing those phases (O Line/D line, Kickers/punters and organized/effective special teams, and an offense that values holding on to the ball and a defense that creates turnovers). You can coach players to excel in these areas, but you also have to have talent to achieve these goals.