Hey @Julian@acrivitypub.space I have been looking around at community platforms for a bit and I think your comment about forums fading out to Discord/chat engines is pointing at something people are struggling with.
Fundamentally the difference between a Forum and a Chat Server is the social anticipation of persistence vs ephemerality in terms of conversation.
In Forums people post for posterity, declaring a subject for discussion and anticipating others will join the conversation now but also later, and the thread will become a reference point. Sub-forums declare the permissable context for threads within them to creat structure end encourage new thread creation, while building a segmented index. Many forum users of the old school frown on new users creating threads for subjects addressed by prior threads rather than searching for and reading then joining in on prior threads on the topic. For this reason, and the old school way that most forums only load comments upon pull/refresh rather than live, people who seek immediacy do not feel welcome or satisfied with the old school Forum experience.