As long as the people are willing to listen and/or they've completed the raid before, then I personally have no problem with someone not having a mic. I think OP is referring to anyone not listed in these two categories. Also it can take longer sometimes, but besides that, it's not a big deal. Hell, even when I played DayZ SA we had a guy with no mic running around with us. Was a bit of a risk, but he listened when someone gave him orders, so it was no problem.