The second you die a window pops up that asks you if you want to return to the start of a dungeon. It only doesn't work if it's a trial or normal raid.
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If the core of the issue is having periods of inability to play during a duty, then by that same logic it could be argued that healers are guilty of the same thing if they dont rez you the instant you die.
it’s not always the healers. Sometimes the tanks (and occasionally dps) are at fault for the death of the healers (cleave, not stacking). Sometimes it’s a sequence where healers are on CD to and they have to move or provide extra healing for the remainder of the group due to an incoming mechanic.