It was/is literally so simple that good old Art didnt have a written playbook.It is incredibly simple. Though the decisions players make can be complex. And it’s effective if your opponent isn’t in shape and doesn’t have depth. Which most teams didn’t from 2007-2017. Now they do. Not to mention you’ve got to have an elite NFL talent at QB like RG3, Keenum or even Dane to make it work. A tackle and a deep threat snd you are in business.