Well said, right here^^^^ 100% agree. The ol' Bend-But-Dont-Break defensive philosophy simply isn't going to beat the better teams. You can't always count on the offense to self-destruct. I thought Dallas rid themselves of this philosophy from the past 2 DCs (Nolan and Marinelli).
If the DBs are good, then lean on them. Put 10 in the box and trust your DBs on the outside to make plays. Just giving team easy 5-yard throws and not pressing the LOS on 1st down (allowing 5+-yard runs), it's not a winning formula. The constant backpedaling by the defense takes whatever aggression they had to start the game, it goes away. And you just can't turn it on in the 2nd half after backpedaling for much of the 1st half.
The fact that Quinn can't see this means...he's just not effective enough as a DC. And certainly in the Big Games, he's downright stunk. Bad early game plans, late adjustments, poor blitz schemes, no deception, sheesh! He's just an overrated DC, to me.