When parser coming out officially, it's easy for new player or lag player to be kicked out from normal content that do no have enrage mechanic, A.K.A normal dungeons.

People will make comparison with class then the demand for change will increase, why this class low DPS why this class have higher dmg Mitigation, why this class can do more HPS and so on.

Under perform class will be left out or not needed, Just like WW Monk from WoW from last patch.

I recommended for dummy parser to help player with their rotation, but no more for that esp inside instance.

Well this is only "my opinion".