I'm starting to see this as low as 12u. Umps wanted the entire ball over the white and nothing above the belt. "pitching" was off the table... All we could do was throw cookies. The only prayer we had was to mix speeds... its getting ridiculous!!!!
I am sure there are some with a heck of a lot more experience than myself in this realm but at 12U what I noticed more than anything were the umpires were not overly experienced on movement pitches and that in turn made it seem like they wanted everything right over the white... Couple that with catchers that are still learning to frame pitches and set up on pitch calls and you will get umpires making what I always referred to as "interpretive balls and strikes"... Definitely frustrating but it is something that should get better as you move up in age classification or play in the bigger tournaments...
However, I have seen the quality of umpires decline significantly over the last several years, regardless of the level of play or competition...