It sounds like the author was mostly thinking about INTERNAL discussion, but I think the real tragedy is in using chat like Slack for your public customer community forum.
Think of all the knowledge and employee-time locked away in the scrollback of a chat based community forum.
Better to have chat for informal community discussion, but when someone asks a question that others in your community might find useful in the future, politely direct them to post it in a more permanent (read: accessible via google search) medium.
My experience so far with companies that operate in this manner, has been something like:
1) Community member asks question.
2A) Answer is already in documentation, which can be easily linked to.
Or
2B) Can be answered in-line, with an action item to add clarification/more details to the docs.
This feels like a pretty scalable solution for the most part. If there are still recurring questions you might want to look at the discoverability/layout of your docs, but usually I've found that other community members start linking each other to docs if the same question comes up again and again.
Think of all the knowledge and employee-time locked away in the scrollback of a chat based community forum.
Better to have chat for informal community discussion, but when someone asks a question that others in your community might find useful in the future, politely direct them to post it in a more permanent (read: accessible via google search) medium.