I said this at the time, and I stand by it.
Green Bay came out that 2nd half and loaded up the line of scrimmage, practically daring Dallas to throw the ball. The Cowboys were going to have a tough time running the ball successfully against the style of defense the Packers were playing at the time. It matters not that Dallas had run the ball well in the 1st half. Green Bay made adjustments, knowing full well that Garrett would respond by throwing the ball if that's what the defense showed him. Honestly, however, how much time was Dallas going to run off by going 3-and-out with the running game? They weren't going to run any more time off the clock than they did throwing the ball.
I honestly understand the "logic" of throwing the ball there. If they're sticking 8 in the box on 1st and 2nd downs, and you run it anyway, you're (most likely) facing a 3rd and long, and again most likely, a 3-and-out. By throwing on 1st and/or 2nd downs, you're most likely going to find yourself in a more manageable 3rd down scenario. Easier to convert and extend the drive than 3rd and long.
I really don't have an issue with that line of thinking, in general. I do, however, have a huge issue with not even making the attempt to run the ball on 1st down. See what happens. Maybe Dallas picks up more yardage than you would anticipate facing an 8-man front. But if you don't and then go pass-pass-pass, at least you tried, and have something to bolster your argument. So while I think the philosophy is somewhat sound, Garrett and Co. didn't do a good job of testing it out.