No one wants year 1 and 2 items they already have. Last several engrams I’ve gotten were duplicate items from vanilla destiny. I’m getting real sick of it.
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Bright Engrams should drop more often and from more sources, but making them guarantee cosmetics that you don't own would mean you'd have everything in the store within a few seasons, and you'd never buy anything with Bright Dust, because you would just be able to farm engrams for it later on