1) Proximity chat - I feel that the social hub of Destiny is not very social. I want to feel like I'm surrounded by other people, not just see that I am.
2) Trading - to be able to trade items with other Guardians would be an awesome social experience.
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I'm with you on the first. But the second I know why they won't. The gear you get are like trophies it's something you worked for it would be way to easy to pass it up to your friend taking away from the quest to find it and then the feeling of finally getting that sweet gear you wanted so bad.