Bungie you might need to exclude legendaries from exotic quests and legendary weapons that pair with exotics. Specifically the Drang. Without Drang, Sturm Exotic uniqueness would be extremely hampered and lose a little bit of its utility.
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Said this elsewhere but I heard a rumour that the legendary counterparts for y1 exotics like Sturm and Mida would be brought back in some pseudo exotic fashion where they would be immune to sunsetting.