In the past 20 years I've lost multiple files to bit rot on NTFS. In my opinion, the primary purpose of a filesystem is to reliably store data. Checksumming is

In the past 20 years I've lost multiple files to bit rot on NTFS. In my opinion, the primary purpose of a filesystem is to reliably store data. Checksumming is not particularly complex technically, does not impose significant run time costs, and allows the filesystem to at least detect when data has been damaged. Unless there's some other very compelling reason to not do checksumming, it's reasonable to consider it's omission to be a de facto bug.