Also known as a fan's opinion. Great thinking there...
Why? Why is that some "given"? To defend the fact that the Cowboys offense wasn't good? Once again, fan opinion vs the truth. I see the pattern. Their offensive struggles and issues weren't by design or some result of being "run first", they struggled. And nowhere more evident than in the red zone, where "run first" should be an advantage not a disadvantage, yet they were still 22nd in points scored and bottom of the league in red zone.
If your "style of offense" is your excuse for failure to score points, guess what? Change your offense!