I fell as if i'm traped to one class because i have to do the exotic quests like Cayde's will on my other classes when i already have the gun another class. i think all quests should move to account wide so even if i'm on a different class i can still do quests that are on my hunter on my titan. i don't want to have to stick to one class because of this reason so i believe they should change it to account wide quests instead of class wide quests.
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You can just reacquire any exotic gun with your other classes - via your collections tab - without doing the quest 2 more times. Or, I guess, you could just throw the gun in your vault and share it that way.