The collective belief that you own your home is a crucial part of its value. If you come home and find a bunch of people partying in your kitchen, you can tell them to leave, or call the police and they'll drag them out. That's all due to the collective belief that you own your house.
Without that collective belief, owning anything is a huge effort to defend it against whoever else it might appeal to.
Without that collective belief, owning anything is a huge effort to defend it against whoever else it might appeal to.