This is an easy question to answer. It's because Lashlee is a joke of an OC, that honestly doesn't know how to play situational football. He has some of the worst in game instincts I've ever seen. It's 4th down, you need a yard and the box is stacked. Why wouldn't you give yourself the best shot at a 1st down by NOT RUNNING INTO THE TEETH OF THE DEFENSE? Oh, that's right, it's because Lash is a gimmick playcaller that belongs at a random midmajor.
In a 4th and short situation, you shouldn't be running out of the shotgun. Secondly, giving your tailback some help in case something breaks down would be nice(IE a **** fullback or TE as an HBack), and utilizing some motion to force the D to adjust would be in order as well. Miami just comes out in the set, doesn't throw in some eyecandy and then runs straight ahead with a guy that is small as ****(Rooster). Brilliant nonsense. GT was DARING Miami to hit the tunnel/bubble screen, and Miami didn't even bother. You need one yard. Go Trips with your best blocking TE as one of the receivers flexed out, force GT to either adjust(Which means they have fewer in the box), or you take the easy throw and pick up the 1st down.