It's probably more economical for hosting companies to use lots of cheap drives in a RAID configuration. For my own desktop PC, I'd rather use a single SSD with a good reputation for reliability, together with frequent backups.
Of course, a RAID is only useful when the failure is drastic enough for the controller to notice it, which some of these power-down failures may not be.
Of course, a RAID is only useful when the failure is drastic enough for the controller to notice it, which some of these power-down failures may not be.