So instead of fixing the problems in your raid RIGHT AWAY, you prefer to look at the problems after you wipe?
The same people, with a parser or meter, would make the same mistake, but with a meter, a RL can remind them and correct it instantaneously.
People who only stares at meters will still be axxxoles without the meters. People who can well utilize the meters will still perform good without the meters because they actually use their brain. Meters make the work less tedious.