I’m going to hit you with that argument.
Umpires are disciplined. Umpires with bad calls are re-trained, but other disciplines are kept quiet due to union regulations. They do not get demoted, but they can get suspended. Joe West was suspended for an altercation with Papelbon, for example. Once in 2013, an entire crew was suspended for job performance issues.
Largely umpires have fought against technological advancements like Questec and STATCAST, but many have admitted these systems have helped them improve their jobs and even alter their perspectives.
It is worth noting that since umpires have been graded against these systems, the frequency of bad calls and ejections have declined...