No, that is just a method lazy people will use to get easy weapons. Also I do not want to see the start of a new scam where people will start charging real money for weapons. I can just imagine the extortionate prices con artists will charge for exotics, that must not happen.
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If you have to trade weapons of the same tier that won't happen. You won't get new players getting amazing exotics and legendaries because they would need to give a legendary or exotic in return.