Annoying when you're on the wrong side... baseball keeps talking "robot" umpires but then it might as well be a computer simulation (I think sports betting and fantasy leagues have irreparably screwed up professional sports)
Pitch framing... pitchers and batters having to adjust to a particular umpire's strike zone. That's how it works. How's the manager supposed to head butt the ump and kick dirt on his shoes before getting ejected if it's just a computer algorithm?