I'm a big gamer and heavy Discord user. Haven't heard anyone even mention TeamSpeak in a long time so I'm surprised by this comment.

It's still used milsims like ArmA and DCS (where there are plugins for radio simulation integration).

This is the only place I have used anything but discord in 6 years.

I agree, though discord recently has put out updates to improve audio quality in those instances.

That being said, I would argue that any voice chat with more than 10, maybe 20, active people talking is going to be nearly unusable. Not due to audio quality.

Teamspeak supports plugins so an entire server of 100s of people only hear the players in-game that they are actively working with.

It turns this (https://www.youtube.com/watch?v=9dM3HqNFox8) into this (https://www.youtube.com/watch?v=Znv6Cf4IKgE).

One of the really underrated features of ACRE is that it lets you force audio to only play on left/right ear. In Arma, if I'm talking to a character directly in front of me while while listening to 2 radio channels that have people shouting in mono, it all turns into a muddled mess of sound. If I have someone directly in front of me, one radio only going into my left ear, and one radio only going into my right ear, my brain can handle conversations without feeling too overloaded.

I use discord as voice coms to raid in wow. A raid can have anything between 10 and 30 people.

Maybe it’s the wow culture of having raid leaders and specific callouts, but it’s very much usable and enjoyable.

If you want to see how it usually plays out, just search twitch for anyone streaming a raid.

It's mostly total lack of voice normalization killing it.