Thanks Rich. It sounds like my understanding is correct other than I need the step at the end when booted into Big Sur to remove the beta profile. I'll give it a try soon when I have time.

The use case I’m thinking of is creating these structures locally and then storing it (either in JSON or Core Data) so I can use the UUID to get an identifier and then store it so that it does persist with the data later but I understand the point you’re making @iressler. For Core Data you might be able to use the objectID, but I have a vague recollection that the objectID can change between initial creation and when it is stored to the persistent store (i.e., SQLite).