The main issue with meritocracy is how do you measure the level of merit? How does this singular focus upon a predetermined measurement and comparison of people

The main issue with meritocracy is how do you measure the level of merit? How does this singular focus upon a predetermined measurement and comparison of people affect society as a whole or social organizations within society? I believe it can result in hiveminds of similar people, since meritocracy is so focused on measuring and comparing based on a limited set of criteria. Over the long run, narrow groups of similar people do not make an innovative society.