It was jarring to see the strike zone at first, maybe ten years ago? It looked like something out of MLB The Show. I’ve gotten used to it over the years, just like I have gotten used to the pitch type and speed popping up when the pitch crosses the plate, which started maybe four or five years ago. I wouldn’t miss that one so much, but I might miss the strike zone at first.
Remember maybe a decade or so ago when umpires tried policing batters for delaying games dicking around at the plate, like stepping out between pitches, by enforcing some sort of time limit on them between pitches? It worked for about fifteen, maybe twenty minutes, but then they stopped because players were grousing too much and the league wasn’t really standing behind the umps on the effort. Plus, there was no real penalty on batters for infractions, like a ball called against them, and no similar effort to stop pitchers from slowing down the game as much as they wanted, so why should the batters have to listen to umps pick on them? The only thing that ended up working to stop the dicking around was the pitch timer, since the umps could just say, hey man, don’t yell at me, it’s the timer, which you can plainly see. It took the blame out of the ump’s hands, which is why it works so well. It’s transparent, with universal, consistent, unavoidable enforcement.
Same thing with having umpires police moving mitts. It would create nothing but headaches for them having to deal with unhappy catchers, pitchers, managers and base coaches on what would appear to be subjective judgments in the moment. Get some sort of automated system that detects moving mitts, with audible tones for violations, and it might work to stop egregious pitch framing movements. Or else go to a fully implemented ABS regime for each and every pitch. That would definitely work to stop egregious pitch framing movements.