Even if you believe Star Wars is just supposed to be about the Skywalkers, there’s nothing wrong with having the last trilogy be about the influence of that family and their story. That’s still ostensibly about them.

Rey Nobody, a girl who becomes a hero from being inspired by their legend, is a meaningful way to cap off their legacy. It’s a lot better than a daughter inheriting her father’s responsibility and just seeing it through. (also why Kylo/Ben not seeing his through was interesting!)