Most people don't understand the career of Prescott and what type of QB he was in college. In college, he was NOT a pocket passer, never had to be. IF a guy was wide open, he hit him, if nothing great was there he could simply pull the ball down and run with it. And he tore up the college game doing that. Never really had to sit in the pocket and be disciplined, anticipate, or "throw guys open". Didn't really need good pocket awareness or had to throw the ball away because he could simply take off.
Now he enters he NFL and his first year he is mostly handing off to Zeke and plays behind the best Oline in football. Piece of cake. Had plenty of time to survey the field, dump off some passes and hit some guys down the field that broke open. No pressure. Then 2017 comes along half way through the season and the line collapses, the scheme is redundant and figured out, and Zeke gets suspended. Coaches have film on his and take away his tendencies. All of a sudden the pressure is all on him, the pass rush is getting to him, and he doesn't have his workhorse. So its taken him a year of going through that maturing to learn to develop handling the pocket better when things don't go well. He has HAD to learn this.
Anyone that doesn't look at the QB he was and see he had a learning curve simply doenst understand the game. Growing pains are part of the game. He has come out the other side better than before and still made the pro bowl. The players around him are coming back together and I expect the kid to take off at this point.