samueldr: bbigras not even the 1-click voice chat; but you can do twitch like streaming easily (share your desktop or window)
Ultimately so useful for helping fix issues for others.

I guess i'm just pragmatic and not driven by too much dogma.
I"m happy to use anything if its the best.

At least discord if not open-source directly; has many OSS contributions
https://discord.com/open-source