I loved the little touches they put on the fireteam chat. Once you're partner or partners went farther away from you they'd sound as though they were talking through a radio. Up close it was like a face to face. Even in rooms the voices would echo! These were nice little features in my opinion. On the note of proximity chat. I don't know. It was always in halo. I guess I wouldn't mind it if you ran into someone exploring that wasn't in your fireteam and just had a chat about what's ahead. Might be a nice feature.