Physical land is quite different. And if squatting is legal, it makes a kind of tax of ownership and also means that any registry is invalid.

If you are saying the physical house only and not the land that is different yes. Someone who can move the house obviously should still own the house. Trespassing usually doesn't invalidate ownership of all your belongings.

More important is the meta concept of like we write confusing contracts and then execute them and we agree on an end date (all transactions done) and then informally and implicitly we agree that if anything was wrong you only have z years after close date to fix it.

This is kind of thing where big people can do it themselves and other people perhaps need a regulated entity to review their docs ... Like mortgages and what not.

The interesting thing here would be if the IRS decides to have an opinion ...