Sorry, gotta disagree. As Gabriel García Márquez said: “All human beings have three lives: public, private, and secret.” There are very much borders in human relationships and while we may not identify them the same way a nation-state does, there are borders.
You’re assuming these borders are hard. I think SSI lets us make them extremely flexible and move them all the time. You’re creating things to argue with based on assumptions the technology is driving the architecture.