Honestly I think its going to be patched in much further down the line. Proximity chat is something they only saw on the forums a few months ago. It might even have to wait till Destiny 2 comes out.
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But proximity chat is years old. I remember Killzone 2 back in '08 had proximity chat. How was this not an idea from the beginning?
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Nothing is perfect maybe they just didn't think about it or maybe Bungie never used proximity chat and they have no idea how it works.