Bill is a conservative defensive coach and always has been. He is perhaps the best defensive coach ever, but his style has always been run the ball, manage the clock, and rely on the defense to get a stop when needed. It was only Brady's shear greatness coupled with Moss that allowed for a more pass heavy attack for a few seasons, but otherwise, hand the ball off and get out of the way. I mean at 44 in Tampa Tom set several of his own personal records passing the ball.
And while that style worked great in the early 2000's, it is a relic that I just don't think will work in the modern game.