RAID is more likely to fail than a single disk. You have the chance of single-disk failure, multiplied by the number of disks, plus the chance of controller failure.
RAID 1 and RAID 5 protect against that by sharing data across multiple disks, so you can re-create a failed drive, but failure of the controller may be unrecoverable, depending on availability of new, exact-same controller. With failure of 1 disk in RAID 1, you should be able to use the array ‘degraded,’ as long as your controller still works. Depending on how the controller works, that disk may or may not be recognizable to another system without the controller.
RAID 1 disks are not just 2 copies of normal disks. Example: I use software RAID 1, and if I take one of the drives to another system, that system recognizes it as a RAID disk and creates a single-disk, degraded RAID array with it. I can mount the array, but if I try to mount the single disk directly, I get filesystem errors.
Fun fact: in the boiling frog experiment, the frogs were ‘pithed.’ Jam a stick in their skull and scramble their brain.
Frog spinal cords have a lot of reflexes. They’ll use one leg to wipe a painful stimulus off the other. They’ll jump. But they accommodate pretty quickly and won’t get excited enough to jump out of slowly warming water. Gotta have a brain for that.
Recounted here: https://archive.org/details/studiesfrombiol00martgoog/page/398/mode/2up
Original ref: Goltz, F. 1869. Beiträge zur Lehre von den Functionen der Nervencentren des Frosches. Berlin, 1869, p. 127, etc Which is actually online: https://ia801200.us.archive.org/15/items/b22344937/b22344937.pdf