While having a microphone is not required to be on a team, it is more than certainly imperative to any game/scrim you might play. Having a microphone lets your team know how you're doing as a HoF, if you're on a chase, if you can't clear on LO, if you need a pass or when you're going to hit the flagstand as a capper. Again, you don't HAVE to have one. Not having one doesn't make you worthless, however, it just puts you at a disadvantage.