It's used widely in fancy videoconferencing setups.
The mic array for the room figures out who's talking and isolates the audio from them.
(Videoconferencing in large rooms has long picked the loudest microphone to use at any time, to avoid mixing in noise from other mics, but then the beamforming makes it that much better.)
I'm wondering if that's why those kinds of setups offer good audio if only one person speaks and there's clear pauses between people, but as soon as you have a quick back and forth or two people talking the audio turns into complete mush.