My friends and I had a minor dispute about why Xur is even in the game. I thought it might be interesting to see what the community has to say.
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I feel like Xûr was added so players could obtain exotics more easily. Because if you remember in a e3 presentation you got loot for killing bosses instead, so back then you would farm bosses to get good loot. Since that got removed it would've been much more difficult to get exotics. Thus Xûr was added.