Second, those registries are much harder to find me in than a random Facebook Marketplace ad.
Third, those registries do not advertise that I am trying to sell my property or rent it out; there is no invitation to come to my home and approach me. I have literally had people show up at my door asking why I'm there if my house is for rent. Imagine if one of those people - as is common on Facebook Marketplace - was unhinged or dangerous, or got mad when I told them the truth.
It is a direct threat to my safety in a way that the mere record of my ownership of the property wouldn't be (if it had my name on it).