I don't know rugby but policies that like can work if most every call is subjective, because a culture of disputing calls leads to a bad product. Like the whining in basketball about officiating, and flopping, on every play is just awful to watch.
But with pitching and balls/strikes it's objective. It was either in or out. On a macro level maybe the pitchers getting upset from time to time could help things change for the better... be that robo umps or just umps assessing their own processes better or policing each other better. Like, if the ump is egregiously wrong they should be put on the spot.