I have watched it and it's clearly a different philosophy. Your arguin context, but that same context had Romo doing what he want all over the middle of the field.
Dallas wanted to keep attacking while you are suggesting they play conservative. The problem is, we've see plenty of the same old check-down offense with teams playing Dallas in the same manner of safeies dropping back getting this team absolutely nowhere. So Dallas nets 9 yards, they still got what is still a 3rd and long. The same LB that was defending Escobar, where Murray stopped for the check-down, he could have pursued him and tackled him within that space as well. They still would have had to gamble the next possession in my view.
The reality is, even if Romo had time, he didn't have time in the context of the play-design. He looks at Dez or Williams, the WR playing the inside and then Escobar makes the cut. By this time, Escobar has his man beat because the LB actually trails behind him. The problem is, again, the tackle had beat Frederick and made his move already around Frederik's right side and was comig up the middle. So Smith is getting pushed back and the tackle is coming up the middle and Leary comes out of nowher taking out the tackle, but obscuring Romo's vision, for which he has to sail the ball up. If you look at the .gif that as posted, you can acally see how Romo has to elevate the ball in the middle of his throw, which he didn' want to.
A 3 man rush is what beat the Cowboys there. And as others mentioned, Escobar rounded his route, but I don't think that would have mattered, just because of the pressure up the middle and the situation in the pocket