Exotic quests should be account wide. Why should I grind out Rat King 3 times when I can just pull one from collections. It's just not a well thought-out design.
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Power level drops
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That's a very long and arduous process to get something a Forge or Menagerie run would take care of. Also, Y1 exotic quests are capped at 380 still.
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Not worth it in most cases.