Tom Landry didn't even do that, yet his teams enjoyed 20 straight winning seasons, 5 Conference Championships, and 2 Lombardis. Tom Coughlin had 2 Lombardis as well and he was pretty mild mannered on the sidelines.
All this rah rah yell at guys is OK as long as you're also football smart and a great leader.
You can win with it (Tomlin, Hardball ex 49er) or without it (Landry, Bill Bellyache, Coughlin).