In any raid you're in, as long as it isn't a pug, I can't see equality even being used for that scenario. Maybe for farming raids when you move onto the next one, but definitely not in any form of normal/heroic/mythic progression raiding. It might equate to big damage, but I doubt healers are going to want to put up with us sitting in AoE damage or fire just to build up damage. I guess it could be sorted out, but for the most part I can see healers saying no.