if you have 88 humans doing something which requires judgement, there is no way to have precise consistency. They are calling unbelievable breaking pitches and 100 MOPH fast balls some move laterally, some move down, some are in a straight line.
You will not get machine consistency.
Except that MLB umps are PROUD to have their own individual strike zones. They don’t even TRY. “My strike zone” is a phrase with them. There’s plenty of consistency, in their ego, and their willingness to ignore the rule book and decide for themselves what a strike zone is. Which is why good pitchers study the umps.