The fact that I can’t see their demo because I’m using the device most people use to browse the web is comical. I don’t like criticizing new products but this is clearly made by someone who doesn’t know how to make product, and considering the pitch…
The most important aspect of having effective discussions is reading what other people say, and people are more likely to have the patience to do that when they're on mobile and have nothing better do, rather then being on desktop and supposed to work.
I think the mindset of "participating effectively in complex [work] discussion is not an inherent part of your work" is exactly what desktop-only is concretely pushing back against.