I don't agree, trading weapons and gear would open the game up to abuse. It would also open up the possibility of duping if the trading system wasn't coded extremely well. That being said I do see why people would want such a system in place. Some kind of player driven market economy for materials and ascendants would be a good addition but Bungie would need to overhaul the currency systems.
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Actually it fixes the messed up RNG, you can't dupe if the servers saves instantly, oh wait it does, no server lag no dupe, beside everything is saved on bungie servers, duping will be near impossible.