I discussed this with Pat Kirwan a few years ago.
He told me that ALL of the QB's he talked to (Rodgers, Brady, Brees, etc) said they would rather have more receivers than blockers when facing the blitz. They didn't like having less options of players to throw to. So, I think a lot of these pass happy offenses are due to the QB's telling the coaches and owners that is what they prefer.
What I have seen from the Cowboys, ironically, is that they are more like a Joe Gibbs offense. They run the ball and gain first downs with the running game. Then they have added extra blockers and when the opponent blitzes, Romo has all day to throw the ball. And because the defense is blitzing, it is leaving single man-to-man coverage on the outside. I personally prefer protecting my QB and having Williams and Dez winning one-on-one battles (particularly in today's Pass Interference happy league).
The big thing about this game (and the Rams game as well) is that we kept running the ball even against 8-man fronts. It's apparent that defenses are really concerned about us establishing the stretch running play. So even if they have an 8-man front and we only gain 1-yard, it sets up for more plays later on because you're telling the defense that we may run or pass the ball against an 8-man front instead of throwing it every time we see an 8-man front.
We are protecting the QB, not only from pass rushers and pass defenders, but from himself. In the pass-happy, 4 WR set happy league and defenses geared to stop that, we are dominating on offense by running the ball and adding extra blockers to protect Romo and show threat of a run. Defenses are not designed to stop that at this time.
YR