@seanmp@mindly.social right on. The argument used to be that discussion forums are indexed and searchable (via search engine; forum search engines are notoriously useless).
That's less of an argument today because search engines are pretty crap nowadays too, but just having the ability to have persistent long-running conversations has been sorely lacking in every social media app since Facebook.
BBSes started it all, and they won't go away. BBSes will still be here when Discord fades away.