Halo 4's Social Aspect

This is simply to address the social aspect of Halo 4, specifically the use of the mic. Halo is an incredibly social game, we all know that. Why is it that we can hear the other team’s mic after the completion of a game, and not the pregame lobby beforehand? It’s something small, and while it isn’t “Title Update” worthy, I would still like it to be looked at, and at the least addressed. Surely I’m not the only one who has noticed this, I thank you all in advance for taking the time to read this.