Last I used it I could see multiple people simultaneously. I could even do Together Mode, but it seemed to be rendered on a server somewhere and streamed, rather than done locally. Maybe they were doing that with webcams and I just didn’t notice.

The main reason I was using the browser was so I could use Stylus to make it compact just like Slack. That’s another benefit of the browser approach, but ideally it would not be so obviously inferior to competitors.