Choice is a good thing. Small communites are good. Decentralized is good because then big bullies can't come in and take your community away. Small size and fragmentation are features, not bugs.
Would be nice if the Fediverse had more of that.
There are three or four different "Technology" communities. But there might as well just be one, it's the same bubble in each of them.
Never. There's absolutely no need to use humanoid robots for that, other form factors would be much more efficient.