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'm going to say no, but it's not xur himself, or that he's a vendor of end game gear. I feel as though all exotics should be acquired through bounties only. Xur should sell multiple random exotic bounties per week. This would end the "earned" debate.