It’s the same with the RPO’s. Smart play is for the DE to stay outside and play the quarterback let the interior DL and LB’s handle the running backs.
Yet, so many times you see the DE get sucked down and leave a huge edge for the QB to run around.
I've been saying it for years and I'm just repeating the coaches and players. DL is coached to "play the run on the way to the QB". QB is priority. They don't often ignore QB and focus on playing the run.
Just a strategic choice with pros and cons, one being this causes them to have breakdowns in containment against mobile QBs.
Having the sideline to sideline LBs we have, and what they've developed into, it's less of a problem now. It's easier to keep contain with a DE going QB first every play if your LBs are good. We were getting eaten alive by mobile QBs on simple rpos, passes to flat, rollouts, etc. to start the season.
Aggression enables your DL but tests your LBs more as a result in my opinion.