I wonder if it isn’t simpler than that.
Forums can be “messy”. Multiple long running topics. Over time heat can build up and create drama. Information can be conflicting or contradictory.
Reddit, Discord, Twitter and Facebook are more of an “in the moment” form of communication. They, to varying degrees seem to discourage having many different conversations concurrently and also implicitly provide time boxing on the lifespan of a conversation.
Is it as simple as Drew didn’t want the drama that can come with forums and wanted something more “focused” and “directional”? Something that was more controlled and “sterile”? Someplace he could get in and do his business then get out quickly? Something he does not have to spend time managing? He does not seem to care about multiple points of publishing, so was that just the cover story for what he could not actually say?
Not saying that this would be a valid reason for the decision he made, but it kind of fits what we are observing. I personally prefer a forum for the knowledge base that it can become.