I had this idea a few days ago. As we’ve heard, the way you rank up/down is based on how you perform as a team. For this reason, matchmaking should put you into a game with people using mics if you are also using a mic, visa versa.
Good idea in theory. In reality there are already so many different factors involved when trying to make matches that they’ve probably already reached the point of unworkability.
Factor One: skill
Factor Two: location / connection quality
Factor Three: solo / party
You could put “mic/no mic” into the equation, but it would be low on the list, and my guess is that it would rarely impact the match after all the other factors are taken into account.