My particular use is a bit niche. But there’s actually a wider niche that this fits into, which is that a lot of people used to find the google search feature “Discussions” to be really valuable for finding excellent content about a topic. You can re-create that feature, for the old style boards by the inurl term I mentioned above. But you still can’t include Discourse in that.
Myself, I’m actually looking for a way to find and narrow down venues to have a particular conversation in a modern way 
ie I have invited a friend to a sort of debate, and we want to have modern tools available to us to have it, and to have it in a somewhat appropriate place.