I recently built a 3D printer where the entire community for it lives on Discord. Their website instructions are horrifically out of date because all of the current changes have been discussed at some point on Discord. What should have been a 2-4 day project turned into a 2-3 week project due to the garbage involved in trying to strain information out of a massive multi-channel group chat with terrible search.
Why would any sane developer want to use this system to "document" their project? Written docs have worked well for a million years and there's no need to change them.