I wrote a tool to try to attack this specific problem (subtle, random drive corruption) in the general sense https://github.com/pmarreck/bitrot_guard but it requires re-running it for any modified files, which makes it mainly only suitable for long-term archival purposes. I'm not sure why one of these filesystems doesn't just invisibly include/update some par2 or other parity data so you at least get some unexpected corruption protection/insurance (plus notification when things are starting to go awry)