Say for instance two or three instances have their own version of a sublemmy for some niche topic. Is it possible to group those sublemmys together so I can view posts from each federated instance as if they were all on one site?
Sure, over time things might normalize and one instances sublemmy will probably reign supreme, but for now is this possible?
You mean something like multireddits? Not sure if it’s available right now, but it might change in the future.