If conversation threading were enforced adequately in a Slack/Discord, a bot could watch threads for a heuristic of usefulness and kick off the archival of some form of read-only SEO-happy forum-like store.
It's in Slack's financial interest to prevent this as that it would save messages that would otherwise only exist in their paid version.
Secondly, that assumed that the users are behaving in a way that classifies those messages as a threaded manner. Depending on humans to go back after a conversation has taken place to classify and organize that conversation isn't a highly rewarding activity.
Another concern: The medium is a temporary and off the cuff one.. this may lead to negative reprocutions for non-agreeing tribal members to defame someone. (A sabiture turning on that feature on discords that are private) [Given today's moralistic "cancel culture" - this is a very real possiblity]
