This isn’t “one or the other” IMO. There’s room for niche instances hyper-focused on a generalized topic like “math,” “comp sci,” “sports,” etc.

But then there should also be a massive generalized instance (hopefully 2 at least so the competition keeps admins in check) that has a little bit of everything and acts as a Reddit replacement. We can have our cake and eat it too.

Hey not everything needs to be federated! I’m a huge decentralization advocate for large scale community resources but for most commercial settings a centralized service like Slack will do the trick!