In games like Destiny or CS:GO for example, you should not even be allowed to start the activity without a working microphone. I dont care if you are antisocial, if that’s the case, those activaties aren’t for you and you shouldn’t bring down your entire team because of that.
As an clarification, I’m more worried about Raids than PVP
I don’t think you understand - a core part of D2 raid mechanics is players needing to quickly and effectively share information with each other.
It’s things like player A needs to tell player B which of 5 buttons to press.
It’s possible to do this communication via the in-game text chat, but there’s a lot of reasons why voice chat is much more effective.