Look at most teams across the country. Most everyone has abandoned the whole *whistle* "stop and everyone watch what Miller is doing here..". That way just isn't time efficient. It's not your daddy's college football anymore. People have figured out that practice is about one thing... Reps. Get as many reps as you can for as many people as you can. The other part is obviously conditioning.
Coaching happens in the classroom. Even physical coaching and drills. Watch the film of practice, coach them there when you aren't slowing the progress of the whole team, and taking away reps from other players. In the classroom, with your position coaches, in smaller groups is where the techniques are refined, questions are asked/answered, and where your butt will get chewed out.
It's a different philosophy then you've seen in the past, so you can choose to agree or disagree. But you can't disagree that most of college football has moved to uptempo everything, including practice. Just ask Nick Saban and Lane Kiffen. Plenty is written about the changes the bohemuth Alabama has been implementing, and how they are among the last to make those changes. If BYU wasn't running uptempo practices, I would argue that they are stubborn and stuck in the past in an ever evolving game.