So let's say you are gone somewhere and you learn that xur is selling something you really want but you can't buy it because you are not near your console. I think that you should be able to buy and exotic gear from xur using the app.
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If you repost this to the feedback forum I will bump this until we get a reply from bungie. It's a great idea! I work offshore on the oil rigs and for 2 weeks don't have a lot of access to a playstation a lot of the time.