As always good advice from Roger.
It is frustrating. My son is at a small college. They recruited him because they liked what they saw him doing. Liked is approach and velo ect for their level. As soon as they got him there they started messing with his mechanics....up, down and out....slow down. Of course his velo dropped. Sadly, this is typical. You have pitching coaches who's greatest qualifier for the job is they played at that level. Does that really mean anything? Who knows, a lot of times not. A lot never evolve either. This seems to be more of an issue in baseball than any other sport and it is maddening.
Imagine if you went for a tennis lesson and the instructor was talking about doing static stretching, touch your toes and gave you a big clumsy wood racket to use....living in the past....this is a lot of baseball. Cookie cutter nonsense.
The sad thing is it limits a lot of players I believe. If you are a kid starting the recruiting process, remember, their (coach, PC ect) job is to win at their level, not to develop you as a player. Most could really care less about that to be honest.
If the body is forced to move quickly it will find efficient movement patterns. There may be some struggles at first, but, the body usually adapts. If you want to clean up some lifting form, put heavier weight on the bar. The body will either fail in the lift or it will quickly organize a more efficient movement.