e.g. a married couple buys a house, then one of them dies, and the will is recorded in a different state and leaves their property to their kids rather than the spouse, that sort of update would not be recorded in the county clerk's office in my state.
That's true--but as I pointed out just now in response to another post, since there is no single government having jurisdiction over the entire world, there is always the possibility of events happening outside a given jurisdiction that affect the ownership of property in that jurisdiction. No system of records in a jurisdiction can completely prevent that.