Many NAS work like that though. Hardware RAID always seems to work like that so if you get a fancy card that supports RAID you been make sure you have a good long term support contract that will be there for you when there are problems (if you are not paying hundreds of thousands per year you don't have a good support contract)

Not all are that way. Many run ZFS which is great for this and you can replace broken hardware and recover. BTFS is commonly used as well, probably not as good as zfs but likely good enough.