Its NORMAL MODE, it should not even need communication in the first place.
Its the old FLEX which was created for LFR people trying a little more difficult content with a set group for the first time.
What in gods name are you people talking about.
I am not talking about Mythic raiding here.
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Some people are really shy, takes years to get to a stage where they feel comfortable with other people.
Some people play in their parents living room and find it rude to talk to people online while they are there.
Some people play in their bed room while their partner is sleeping.
I dunno, shit happens.
Normal and to an extent heroic "raiders" should not even need mics as long as they listen.