Proximity Chat

I was just wondering if anybody knew why proximity chat was removed, and if it may be added back in, because me and some friends would play some custom games that required this feature of the game for the custom game to function properly. If anybody has any information please post on here and let me know. Thank you.

They also got rid of talking to the other team in the pregame lobby which is annoying.

I wish they didnt take that out, if was fun trash talking each other before a game started or in game hearing them after you killed them or visa versa, made halo fun.