People who are good, and can successfully signal that in the job hunt process have tons of options. So yes, everyone is replaceable, but it takes time and money

People who are good, and can successfully signal that in the job hunt process have tons of options. So yes, everyone is replaceable, but it takes time and money to do it. Someone having a weird attitude toward the performance management system may not be a good enough reason to replace them if they get the job done. Hiring a new person may be more of a headache for the manager.