Personally i think its a good idea, just so that you can help friends who have just started by giving them materials and weapons you don't use. What do you think?
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I think it would be a good idea, but not quite yet, I don't think the game inventory is assume enough to require trading(even if it would help me get my hands on the elusive Gjallarhorn!) That's why I think the legendary and exotic weaponry should be upgraded not necessarily the armour, but the weapons at least, just to improve the diversity of weapons used...