Technically, better chance of getting data off of an HD with HFS+ than an SSD when they have died. My SSD failures seem to have been dead with no chance of ever getting anything off of it, one way or another while the HD's that have died, or about to die, I was able to get all or almost all data off. HD's give you clues they are dying most of the time but SSDs and flash drives seem to just give up the ghost all of a sudden, in my experience. SSDs are limited with the amount of data that can be written, while HD's can last over a decade if properly cared for.
Rule 1: If you don't have a backup, you have no data at all.
I learned that the hard way and will always backup as much as physically possible. Sounds like your friend just learned a lesson he will never forget. Backup, backup, backup...