It's a multiplexer w/ distributed state. If you know about tmux then it's basically tmux but someone else can connect to the same session w/o logging on to the same computer. I can imagine it being useful for debugging production outages b/c several people can use a single "dashboard" for coordinating their work w/o having to go back & forth on slack/zoom/etc. You can ask any chat bot to explain further if you want to look into it: https://share.google/aimode/XadkUVcvpjlYhuWmK

I get the tmux part, but not the slack/zoom part. What does “for all work” mean technically?

The list of people on their announcement page have a track record that will probably answer your question.