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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in the original script and program for destiny 1 there was going to be trading but it was scrapped, with the rest of the original game, in favor of what destiny 1 was bungie has also said there will NEVER be trading, because then the game becomes trade to win and defeats the entire purpose of what destiny is