2. I don't even understand how a title transfer could happen without verifying ownership. Is the title system in the USA decentralized or that much different than elsewhere? i.e. Torrens-style
The claim that the title insurance industry is the reason for lack of adoption of Torrens title schemes is uncited, and immediately followed by descriptions of several cases where Torrens title was adopted (often poorly) and later abandoned.
Fascinating, how is ownership established if there is no single source of truth?
I feel the answer to this is also crucial to understanding OP. It could be a minor annoyance or the real possibility to lose your land.
Property tax is also the other 9/10ths - if someone is paying the property tax they're presumed to be the owner unless there's a court fight; and in fact, if you want, in many places in the USA you can get adverse possession by paying property tax on unknown or unwanted property - or buy them at auction by paying the back property tax.
The ones you can easily do this on are all various kinds and forms of worthless land, but hey, it's out there!