As someone who works on embedded devices: HDDs are used for media storage and can be easily replaced. Any NAND as a limited life span and good embedded software will try very hard to minimise writes. Though in my particular area, there’s additional security constraints on the OS, which preclude any removable flash storage from being used.
sɐɯʇsᴉɹɥϽ ʎɹɹǝꟽ