It wouldn't ruin the game because you'd still have to be a high enough level to use the gear
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At the same time, anyone could just trade idol weapons, they have received multiple times. i.e. people could just trade ice breakers, vexes, fatebringers etc. Maybe they could apply restrictions to the weapons that could be traded, but that would somewhat diminish the purpose of the trading system after a few times
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At least do a make it so you have to trade like legendary for legendary or exotic for exotic. Or even pay with motes or strange coins.