Yahoo Sports NFL on Garrett Celek

From the article

Tight end Garrett Celek broke down the benefits of Chip Kelly's simplified offensive playcalling in 2016, noting that the reduction in verbiage and use of hand signals made plays quicker and easier to remember: 'In the past we had a lot of delay-of-games because either we're not getting the play in time from upstairs or it's just taking the quarterback too long to read the whole play out. Where now, it's a lot quicker. We have hand signals, so you can't have 15 words through hand signals, stuff like that. It's got to be boom, boom, boom. So when you got less verbiage, it's easier to remember.' This historical example is cited as context for how simplification can improve execution, though the 2016 offense ultimately finished last in yards and points.