The only type of trading I would even want(which I'm fine without cause I'll be playing this game like crazy.) is, if my friend and I play a raid/strike over and over trying to get a drop, and my friend gets what I want and I get what he wants, we should have 1min to trade/swap rewards. We still earned it, and we booth get to help each other. This would also be a nice way to make friends and build trust with fellow Guardians. Would make it easier on everyone that wants to help new players in the game. After you leave the round all trading and swapping should be locked and over with. I'm for this but I'm ok if they don't add this. (Down with gold farmers!)