Perhaps it strikes you as "utter nonsense" because you don't know enough about (A) opponent matchups and (B) setting things up for subsequent plays outside the tackles. Scheme-wise you can't altogether abandon the inside run game even with paltry returns. Consider Henderson's attempts vs. Tampa: most were inside, a couple/three yards and a cloud of dust, then he rips two long-gainers around end for touchdowns. If you followed the progression of run plays and blocking combinations that wasn't just happenstance.
What YOU think "doesn't work" probably DOES work to the extent present OL talent is capable vs. teams they've faced. Or maybe you'd like McDaniels to call nothing but sweeps and see how that works. Hint: it wouldn't.
But to my earlier point, the short-yardage run game would be more productive with better offensive linemen. During that marathon series of goal-line plays in the Bengals game, McDaniels called a pretty wide variety of things (and that pick call nullifying the scoring pass was bogus).