This, this, and more this.
The guy who makes ~3/4 of a million dollars every single year to field this garbage cannot for whatever reason understand the beautiful simplicity of this idea. The offense knows where they're going before the ball is snapped. It's the element of surprise, and it's a huge advantage. What we do––apparently––is forfeit this so we can run a no-huddle clock-draining offense that can barely get set before the ball is snapped. If we execute the snap without dropping it twice in a game, or without drawing a procedure penalty, that is our new benchmark for success.
Meanwhile on defense, how many games do we have to watch guys looking around and flapping their hands literally as the ball is being snapped? I'm not a football expert, but if David Santos is looking sideways at Trevor Roach, or backward at Corey Cooper, I can imagine how this might lead to him getting out of position.