Seems like this is primarily reducing the friction of entering a new channel and talking. And you get visibility into who's in there. In Slack you'd have to either start a new call or join one.

On a related note, does anyone wish they could just follow along with a text-to-speech version of a Slack conversation? Especially given you can model someone's voice with a 15-second clip [0] - I wonder if it would be less distracting to just hear messages play with unique voices that match your coworkers instead of alt-tabbing or seeing notifications on my screen pop up while doing semi-focused work.

0 - https://google.github.io/tacotron/publications/speaker_adapt...

How is this not like any other voip ? looks like discord to me?

Looks like gamed upvotes to me. Reading most of the article it seems like they created another teamspeak

does anyone know a foss audio/screensharing solution that works on linux and windows?

Riot does that.

https://github.com/vector-im/riot-web/issues/238

This is just Discord for Business (which would be an excellent product on its own).