Having self res allows a Warlock to play much more aggressively, in a similar way you can do with a Titan Defender. You can pop your super to get you out of trouble to a certain degree. In tougher situations sometimes death happens. You're on 3rd stage hard confluxes and 2 hobs shoot you within a second of each other or the templar goes nuts when you have the relic. If you have res you use it, finish the stage, if you are running voidwalker you effectively wipe. It'll be immense when the Crota hard raid comes. Your argument has little bearing when talking about generating orbs as well. Hunters don't generate enough to be useful, and neither does the Titan defender bubble which is the most useful Titan ability. In fact the Hunter's supers aren't really worth much in PvE at all. If you run a nightfall or a hard raid with a Warlock without res then you're an idiot. Plain and simple. And you're REALLY letting your team down.