Muting only deals with the individual whereas proximity voice being available to the global community is still active and thus takes away resources that are finite. Imagine you're at a subway station. You hear the din of the crowd around you. In order to avoid the crowd you put on your Beats by Dre and voila, voices are gone, right? Nope. To you the individual they are muted but the station is still broadcasting them. Destiny uses dedicated servers but the bandwidth is finite. To use three voice channels to communicate can work (your fire team). You can up that to six in a squad during a raid. But imagine if 15 or 30 or 100 people are all talking in group space. The system now has to have discrete channels for all of that chatter. And for what? So you can put on your Beats and have a dance off? The game will bog down because of voices which we as a group will ultimately ignore. Bungie's solution is elegant as well as practical. Simply choose the guardians with whom you will work (your fire team or squad) and chat with them. If you want a larger group, make a part using your console's app and friends list and go from there. JTS