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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Hard light and patience and time are the ONLY exotics o got from him, everything else he sold the week after I got the exotic. Armor on the other hand doesn't drop as often as weapons. Only legendaries and nightfalls so Xur is a good addition to get exotics