Edit: technically they are still relevant if the property has not been sold since the records were digitised in the 1990s
I spent a fun evening flicking through the records of owners, the price they'd paid for it, and the few details provided (occupation, etc). All dating back to when the building was built in 1890 or so.
Later I left the country, and moved to Finland. After a year or two here I wanted to sell the flat as I'd decided I wasn't going back. Despite going through the process of ensuring the registry was updated I had to mail them back to the solicators based in Scotland prior to selling the flat.
The sale was carried out 100% remotely; I had a couple of phone calls, and when I balked at the use of a FAX machine I printed out a few forms/documents from emails, signed them, and physically posted them back to the solicators.
Happily I'd had the foresight to leave a spare set of keys with a trusted friend, which were used for the viewings, etc. It probably helped that the solicator who handled the sale had also handled the registration of the deeds when I received them so they were probably confident it was a flat I owned..
When I queried things I was told "The only registry is definitive, but .. things are .. smoother .. with the physical deeds". Made no sense to me, but I wasn't going to argue.
Our PAO gives a receipt at filing. Copies are available after the deed is processed. In my state, they're public record; in my county, they're available online.
source: worked for real estate attorney