why everyone demands mic? is this somekinda ultimate set up and guaranteed win when you can communicate?
Teamwork's easier with mics. Could be just everyone talking about which allegiance to play as to support each other, could be to coordinate objectives, could be to warn someone you're about to get stunned and need a save.
Having mics opens things up for teamwork much more than not having them. You don't need them, but it's usually better when you have communication.