been thinking about multiplayer voice chat in any shape or form

Proximity voice chat:

Dealing with people playing music: cooldown on voice communication

Games that MUST require player voice:

what about voice chat that requires the player to opt-in

This means voice chat was never a core part of the game. I can’t recall any game that has voice chat features but requires it to opt-in. The closest example is League’s all-chat (ability to talk and listen to enemy team) being off by default, but it’s not for voice.

Since it’s not a core part of the game its not good to dwell here.