What "years of institutional knowledge" does Hack Club and others have in Slack? I assume anything more than a week old to be unsearchable. In fact I want chats older than 1 week to be deleted so inportant stuff will be copied to wiki.
We extensively use Canvases, as well as pinned messages and message links to reference others. As in, I often need to look at older messages, very occasionally years old, but usually within the month.