Absolutely love how D2 PVP is moving toward team-focused PVP; however, communication is key. In order to accommodate the deaf and mute community that like to game, I highly recommend a call-out feature (For Honor has a pretty simple "help at (location)). It's relative simple but could mean a world of difference.
In addition to For Honor, Call of Duty (since Ghosts) has had the ability to shout-out locations of where you've spotted the enemy (thanks to IceBladeWinters for that information).
Also, YokiNL suggested adding visual indications to supplement audio ones (e.g. during Countdown deaf an audio cue is played informing players that the enemy has placed a bomb). Suggestion posted at: https://www.bungie.net/en/Forums/Post/229517185?page=0&sort=0&showBanned=0&path=0
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Then all the lazy asshats would say they are deaf so they don't have to put their mic on, AND expect to be treated better because they are scandalously claiming to have an impediment.