You’ve gotten plenty of replies, so I’m sure this has been said. There’s nothing to make the content or behavior better. The thing that’s better is it isn’t controlled by a single entity. If 9ne of the hosts tries to use their power to restrict API calls, for example, the other instances can ignore them. Anyone can always spin up new instances as well.
That said, one instance (Lemmy.world) has far more users and communities than any other, which isn’t ideal. If they were to just cut ties with everyone else then a lot of people and communities would become lost. This doesn’t have to be the case, and hopefully it diversifies, but it is the case right now.