A NFL fan I watch football with kept yelling, "Why is he not taking off running? The field is open in front of him!"
I told him I thought he was being coached to stand in the pocket and show he can be a pocket passer. "Building value for himself at the next level."
I have no insider information to back that up. Just an guess.
Me personally, I would advise Jalen not to run every down, but when the opportunity presents itself to get the first down without taking a serious hit, then make the quick decision and go for it. I think Jalen Milroe is terrifying to defenses when he gets into the open field. He is so fast and pretty elusive as well. He would keep me up at night if I was a DC on an opposing team.
On the other hand, if my rush is getting to him in anything like a reasonable amount of time and I saw him staying in the pocket, I would breathe a sigh of relief, thinking, "Thank God he is not running."
But I am not a coach.