I realized that there are alot of inactive communities across the Lemmy and kbin instances. The beauty of decentralization is that we don’t rely on a central instance, if a fediverse instance becomes the central one that hosts the majority of posts, then if that instance goes down, we lose alot. I also suggest posting to small communities on other instances.
Actually in terms of the threadiverse it makes more sense to join medium to large instances that align with your interests and values. That way most of your posts and subscriptions are local. Then it makes sense to subscribe to the best other communities that are missing from your instance. This reduces fragmentation which is good.
Keep in mind your suggesting promoting fragmentation which is just nuts. Building community scale is the biggest issue at the moment. Keep in mind too that as long as there are 7 or so major instances, the threadiverse is not centralized. It is just more cost and manpower effective to join and donate to larger instances rather then everyone run their own. Presumably there is an optimal instance size. I have no idea what that is.
Long run it would be good to have some tech that fights community fragmentation like the ability to aggregate communities. The other approach is just to let the dynamics choose these and let minor communities just get starved which seems to be the current approach. Maybe that is better, I have no idea.