From what I understand Bungie has implemented a more biased form of RNG where you are supposed to have a lower chance of recieving a previously gotten Exotic. However today from opening several exotic engrams I have recieved
-2 Last Words
-2 Invectives
-5 Fourth Horseman's
-2 Crest of Alpha Lupi (Titan)
-2 Helm of Inmost Light
-2 THE STAG
-2 Obsidian Mind
-2 Mask of the Third Man
-2 Empyrean Bellicose
I feel as though this biased doesn't have much of an affect on engrams