Trading keeps the soul of rng pure while breaching the gap between veteran grinders and noobs. This idea would stimulate the population guaranteed 5x on what we have fallen to today. If any proof is needed look at the WoW community.
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Obviously would need conditions, like you have to have that weapon yourself that you're getting and it has to be base level 1 if it's crafted or something. THat way it can't be just "I traded for an entire raid set abusing it with a friend that can craft all of it" but still be a viable thin if you want a specific roll that someone else has that you'd prefer and vice-versa.