Does your car wash itself? /s

It very well may be! Depending on your distribution... they may already have similar services/timers for periodic scrubbing

On Fedora they aren't provided; but are with Arch

Unless you run an array it's fairly meaningless, beyond being an administrative-reporting tool. It can't fix failed checksums without mirrors or parity

I think the checksums are validated on read anyway, so it's mostly to mitigate bitrot - very specific to 'glacial' storage