nas formats

[Enquiries]

I'm trying to understand why NAS drives are not formatted to standard format types, like NTFS or such. I was very surprised to learn that if my drive bay goes down (the drive bay, not the drive), I would not be able to read the drives without special software (and new drive bay). This seems very counterintuitive. But perhaps NAS is not the best hardware for backup and is merely for speedy network file access? Can I format a Synology to NTFS and be able to read it easily in a PC without major limitation as a NAS drive?
Regards,
Rod