I remember the BU study. I’m not saying umpires are better or worse. But if there’s a margin of error with a tracking system how accurate is it’s analysis of umpires?
One inch is what both articles referenced. Whatever it is, it can get better.
Don't take any of my arguments as wanting robo-umps. I'm concerned with the game changing beyond what is intended. Nothing wrong with testing it in independent or minor leagues. The biggest and quickest improvement (again my takeaway from the BU study) is to move to a merit based system for umpires, instead of seniority.