The above are persistent and searchable, unless you're using the free version of Slack which sets a limit on persistence But regardless, my experience is that

The above are persistent and searchable, unless you're using the free version of Slack which sets a limit on persistence But regardless, my experience is that once languages reach a critical mass they do get real documentation in a more browsable format. And I think Discord is a totally valid temporary solution for documentation, and a totally valid replacement for discussion groups.