As far as the whole Force-ghosts-interacting-with-the-living-world thing, I don’t get what the big deal was. They’ve never been “ghosts” in our real-world sense of the term. It’s always been clear that they become one with the Force, which “surrounds us and penetrates us” and connects all living things. Therefore, if a person were to become one with such a Force while maintaining their consciousness, as they do, I don’t see where it’s out of reach at all that they can still manipulate the living world. After all, Obi-Wan states from jump street that if Vader strikes him down he’ll become more powerful than he could imagine. What’s more powerful than a non-living consciousness that can manipulate the same Force as the living, and probably to a higher degree?
People just seem to be really uppity about something new coming to this universe. I don’t get it. If I wanted to see the SSDD I’d just rewatch the OT again.