I def see the splintering as a positive. Personally, I dont feel I motivated to engage with a community once it starts to feel "too" big. There's a certain size where I feel unmotivated to engage. I know whatever I say there will get lost in the noise and there will be less meaningful communication. If any of my interests on a single server start to get too big where I feel like I'm just adding to the noise, I can always easily hop over to another instance where I can engage in a more meaningful way. I would bet there's a lot of other folks on here who will feel the same. While I'm sure it's likely that one instance for each topic might become the biggest "main" one, I dont think the smaller ones will be any worse off for it.