It would be nice if powerful engrams gave you gear that was higher light than that slot's currently equipped gear. About half of all the powerful engrams I get are lower light than that slot's equipped gear. I work 70 hours a week and it's really hard to level with so little time to game, definitely not Bungie's fault, but I would like to see a change in the way powerful gear levels.
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Powerful drops are based on your overall power level, so in some cases it can be less than a specific item you have equipped