The original build of Destiny implemented better interactions between players and also a trading system between players, if you want this back vote 'yes' and let's try to get this noticed by Bungie's development team!
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#Destiny
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Here's how to do trading system: You can only trade with players that were there in the very same instance that the item was dropped/recieved during a mission. Otherwise, it is completely un-tradeable. There. Problem solved.