The key part for eve is that you can configure it so that fleet commanders (people running raids/operations in game) can broadcast to players under their chain

The key part for eve is that you can configure it so that fleet commanders (people running raids/operations in game) can broadcast to players under their chain of command, without squad level chatter going the other way. Not from direct experience, we used a much simpler setup for some events on a minecraft server to allow for team voice.