TL;DR adding trading would break how the game is set up, which is RNG based so the probability of you getting every exotic is low so you keep coming back and grinding away on destiny to get these elusive exotics. If you added trading then everyone would have everything and their would be no point in playing the game anymore ......... Just saying
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RNG is terrible, if they actually fix it then we wouldn't need trading
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Oh I'm not saying it's good or anything, I'm just saying that is how the structure of the game has been since day one. If you were to change it now it would break the game was all I was trying to say