So, I hate to open up this can of worms again, but....

[Magusrex]

The people on both sides will never see eye to eye on this. One side wants everyone to be accountable for their performance while participating in group content. The other side only wants some people(healers & tanks) to be held accountable while participating in group content. The crazy thing about this is that the people who don't want everyone treated equally have taken the position that those those that want it equal are mean and elitist. If more than half of the people in your group want to wait for someone to replace you because they think your performance is so poor they cannot complete the encounter with you, how is that wrong? If you are under-performing and don't understand why, you could post a parse and ask for some help. I know some tool might insult you, so what. Plenty of good people would fall over themselves trying to give you quality advice on how to improve. How can people help you if they don't know what you are doing and when.

When I ran cutting edge raiding guilds, I took moms who had never played MMOs and turned them into top performers after seeing just once parse from an entire raid. It was either gear, rotation or situational awareness. I could tell them why they were dying, where the rotation was wrong ect. They were very grateful and were able to play with enormous confidence afterwards. I don't understand why anyone deny themselves such a useful tool. Wait here is answer that makes sense. They have no interested in putting in any effort to improve themselves and without meters no one has proof.