Everyone on PS4 has a mic. Whether or not they use it is debatable but the console comes with one. Devs should not use player behavior as justification for ignoring hardware that is already available to EVERY PS4 player. Player behavior will change as the game content changes. Without the game content giving the player an option, the player has no choice either way. (If you bought your PS4 used without a mic then you probably bought a mic anyway or aren't playing games that use them.)