My son is "transitioning" right now. Some pitchers seem to struggle with command at 60' that were strike throwers at '54. I suspect it is mental. Kids seem to make distance/judgement mistakes first couple of games, such as base runners running and being thrown out by 10 feet on a dropped ball at the plate, advancing an extra base on throws, etc.
Slow kids look even slower. Kids with weak arms look even weaker. 250 ft home runs are now routine pop ups. But play a couple games and you will forget about the smaller fields almost immediately.