I think there should really be trading. I know me and my friends would really enjoy trading. I think how trading should work is that you have to be in the fireteam to have the option to trade then you have to invite the person to the trade for on mote of light. then you pick what you want to trade for and make a deal.
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reason to why trading will nvr work is beacuse some people will exploit it hard and really ruin the game... example: friend does the raid on hard get the vex mythoclast twice (2 different runs) trades one to a friend who will nvr do the raid... ruins the whole point to the game then