It’s kinda (not totally) like asking everyone who wants to have any given conversation using Discourse as a platform to use meta. 
Yeah this is true, and I haven’t thought through ramifications of using a mobile interface embedded in Discourse like this.
Have been hearing good things about BBB as well, especially for more “webinar style” events. An integration for it would be good too
AFAIK, it’s the other way around, Zoom copied a lot of the UI/UX for Jitsi and other web conferencing tools over the years.