This really isn't a problem. Not only do you not get great gear from this (raid gear is what matters late game) but you get no EXP either, so no extra motes of light to buy exotic engrams. This isn't an exploit, move on and calm down.
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in fact you get massive amts of xp and motes from salvage
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You get xp for everything. Armor weapons class...
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You actually do get xp, I finished out gunslinger and levelled up a legendary auto rifle at the cave.