I remember a few years ago one of the morning guys on WGR literally said he did not want the Bills to run because you average more yards per pass therefore you can just pass every play. The one thing it did not get into was how the defenders have to read pass or run and how that slows you down, I mean he did I guess but he made it sound like you call a play on defense as a pass defense or a run defense, it is never that easy. You might call a play anticipating a pass more than a run but the players have to read run/pass and it greatly helps the defense when you don't have to make that read.
This video was interesting and makes total intuitive sense to me. The Bills are 32nd is pass percentage, that is too much.