http://www.footballstudyhall.com/2016/5/6/11606684/the-4-main-schools-of-spread-offense-smashmouth-option-air-raid-pro-style
quote:
The good pro-style spread teams are concept based, like the Air Raid, and try to do a few things really well. The bad ones try to mix in spread formations and concepts with pro-style language and approaches, call themselves "multiple," and are inefficient at most everything.
It's very difficult for college teams to actually be really, really good at multiple comprehensive concepts. The amount of practice time and the versatility or roster depth necessary to be balanced between the run and pass is usually beyond most programs. You see this most prominently at tight end.