For posterity, I got pretty annoyed by the clutter of "Type / for commands" and stuff, and used this Stylish theme to clean things up a bit:
https://gist.github.com/rattrayalex/2e4f934045aabc4caeeab249...
https://gist.github.com/rattrayalex/2e4f934045aabc4caeeab249...
But yes, realtime collaboration is a critical feature for documents that can be used during meetings (and IMO ~no meetings should be held without documents).
The other critical feature is comments, which I assume Obsidian does not have support for (they would be very nontrivial to represent in markdown).