"One place" reminds me of <https://xkcd.com/927/>.
Topic on Talk:Discourse
It does seem like it might be possible to start with clarifying and improving how existing systems are being used. I started a topic on this thread asking "How about Discussion on Discussion tabs?"
A forum (to me) is a step back from a well edited wiki page. It would be great if forum discussion outcomes could be fed back into MediaWiki documentation so that instead of searching a forum and filtering out the content that matters users, sysadmins, and developers can find information in the docs as they read them.