I have found slack all but useless for retrieving knowledge.
People simply don’t read emails, and ignore documents.
I don’t miss emails. Wiki devolves into a mess after a couple of years. Sharepoint has poor accessibility as there’s this constant churning between the app space and the web space.
I really think if you want to get people to take a document seriously you have to present it and walk people through it. If you get feedback and integrate it then it has collective ownership and it’s more interesting than a soliloquy.
But according to the popular glib, and I would say incorrect interpretation of agile principles, documentation is considered wasteful.