Most users don't need every single one of those features. It reminds me of the conversations about lemmy and the fediverse after the reddit api uproar. The alternative link aggregators didn't need to do everything well, just the core things well enough to build a community that sustains engagement and becomes discoverable. But it failed at the major pieces: performance, scalability, media handling, moderation, governance, and federation. In contrast, I would argue xmpp covers a strong subset of commonly used discord features well enough to provide the chat/social component to many existing communities.
nemomarx|20 days ago
I think this will be a pretty similar case because discord straddles "small personal servers with ten friends" and "large official servers with 500 users for a particular game" and "tech support forum for an open source project", and one user might be in all of those servers pretty easily.