I think it would ruin the game..
Deej stated this in a live stream with planet destiny.
The whole concept of acquiring your loot by yourself is what they strive for, like jumping for joy as you get your first gjallarhorn or finally get the last piece of the raid gear you need from completing the raid. Introducing a trading system will only devalue the grind of acquiring these weapons and the excitement of the game in general. Think about it, unless bungie put some major restrictions on the trading system nothing good can come from it (Generally speaking). You would have people with say 3 vex mythoclasts and someone with 2 hawkmoons etc and through one simple swap of weapons between players that whole grind and excitement to finish Atheon hard is gone as you have the weapon you wanted just like that. From what I heard, bungie want you to feel like those items you acquired are truly yours and as if you earnt them.
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Epic story right here. "I did the weekly heroic. Hardest level. With ALL 3 CHARACTERS!!! I know, I'm a badass."
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Good explanation, way better than the whole "tell your own story"