If they wanted to implement trading they would have to [b]dramatically[/b] lower all drop rates.
People would trade to get the stuff they want anyway so if it kept dropping like it does people would have all the stuff they want by trading and there would be little incentive to continue.
[spoiler]except non raid loot caches cause those suck anyway[/spoiler]
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some of us don't get anything i have no luck at drops all primary weapons for me are blues even out of legendary engrams, so don't say it keeps dropping as for some of us we see one legendary engram in 11,000 drops