If you don't understand why people would use self-res in pve or pvp you my friend are an idiot. I would give examples but I'm just tired of repeating them to morons.
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It rewards people for remaining crap. Whether it's the warlock themselves or the team they play with, the more often the warlock saves the day with self-res, the longer the team as a whole stays rubbish as they never learn to play without that crutch.