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Just suggesting that maybe the game could incorporate in-game voice chat. Of course with a mute function. Also maybe enemy sounds in the FOW? That way the headsets could be used as an advantage.
I do realize that some people won't/can't afford headsets. It also isn't quite so fair. But I do think incorporating in-game voice chat would be viable; especially in public games with random people going solo. That way the team would be able to communicate with out having to take their attention away from the game to type something out.