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[C o s m o]

It hasn't been removed.  It's an option.  Apparently, my constant requests to Bungie for this feature were not ignored.  

Hit Start, go to Settings.  There you can set the voice to either team and party, everyone, etc.

[lostboyz]

Nope you cant, which im not sure how i feel about. I liked how you could sometimes here someone coming by proximity. Though when those assholes started playing music and crap over it, and it was terrible to mute them.

So all and all no fuss with no chatter.