Gaming, news, tech, general literature. All of these are somewhat thriving, with a steady influx of posts and comments. At the same time, the userbase is sorely lacking for more niche communities. In my case it’d be stuff like poetry, yoga, religion, linguistics, meditation. Or many other communities I’d doubt they’d form a larger userbase here, at least to the degree that it’d foster good discussions. Communities where there are a larger amount of “normal people”, that are not tech-aware, and who have no interest in migrating off centralized corporate solutions. That just want a large space to discuss what they’re interested in.
This for me at least, makes it hard to completely leave reddit (or even Facebook and their groups!). Do you think the fediverse will ever reach the point where this would become a non-issue?
Except that the “for the whole community to come together” part is already provided by the Fediverse, built right in to the foundations. There’s no “service” for the next Reddit to provide to these separate forums because they can already freely exchange with each other. They are not fractured.
Sure, just show me the combined DnD/D&D or TTRPG community | magazine | group. It doesn’t exist. There are a hundred, or a thousand, individual groups. That’s not a whole community. That’s a thousand fractal shards, each one with its own voices, independent of one another. Yes, occasionally they do share content or users, but that happens only rarely and with effort. TTRPG Network, Lemmy.ML, KBin.Social, Mastodon.Social, etc., all have various groups dedicated to RPGs. These groups are not able to be combined.
The inability of these groups to combine and independently organizing is a severe weakness of ActivityPub.
What you’re asking for never existed. Reddit had multiple subreddits devoted to those subjects. Forcing there to be only “one true” community for any given subject is antithetical to the whole concept of free association and free speech, there’s always going to be people who disagree with how the subject matter has been divided up and how it’s being moderated. They’ll want to create their own groups.
You’re probably wanting something like Reddit’s “multireddit” functionality. I know of this issue for Lemmy, with some links to related issues in the comments. Kbin has one here.