so far I found the tools ingame absolutely sufficient to clear havoc 40 with randoms.
reason I dont accept invites is most people expect to “chat” which I clearly prefer not to apart from very close real life friends.
my success in a game shouldn’t depend on my “talking skills” but what I perform ingame.
screeching teen voices, munching and music in the background, no “thick skin” for hard callouts when 
hits the fan….. nope, no voice chat from me.