Modern defenses are not the 3 and out machines we recall from yesteryear. The philosophy now is to let the other team rack up yards and stats. If they want to score, they have to march down the field and stay disciplined and mistake free the whole way. Defenses have embraced that a mistake on offense is much more damaging than a mistake on defense as long as that mistake is not a big play down field.
When Dorsey was hired, I expressed concern that he and Josh both are guys who like the 'big play' and I wasn't sure Dorsey would be a good complement to Allen because I didn't think either one could remain disciplined and take what the defense gave them consistently play after, drive after drive, game after game. They get impatient and will try to force a 'big play' even if one isn't there.
I was mistaken in thinking that they needed to get Allen to change and accept taking the underneath stuff not as an outlet after several seconds when there's no chance at a big play (and he's been amazing when he does it). I had thought that he'd eventually embrace it. However, It's not in his nature to be that sort of QB and they need to adapt an offense an offense that Allen will run and find a way to deal with the difficulties that if they can't get guys open on the 15+ yard routes that's he going to force it so they need to find someone who's plays don't end up with multiple receivers within a couple yards of each other way more frequently than they should be..