Purists and MLB Umpires Union. I get the argument about the purity of the game - to a point. But my patience for terrible officiating has gotten to its limit over the past 10 years to the point where I’m saying “bring on the robots”.Minor leagues have been using a compromise system that has umps making calls, but allows for a limited number of player reviews.
If the tech is there, and “getting it right” matters, why not get it right?