Trading should be open fr the fire team at the mission summary screen. That means you did the activity to earn to gear (since bungie is obsessed with he idea of earning gear) but you just sent win the roulette wheel that is the reward system.
Another idea to balance it would be to only allow trades of the same rarity.
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Yeah a lot of people have been saying this and I think it's a decent idea. Especially since a lot of the rewards post mission most people don't use or don't want.