Well, it’s sort of redundant. According to [1], the raw bit error rate of the flash memory inside today’s SSDs is already in the 0.1%-1% range. And so the controllers inside the SSDs already do forward error correction, more efficiently than the host CPU could do it since they have dedicated hardware for it. Adding another layer of error correction at the filesystem level could help with some of the remaining failure modes, but you would still have to worry about RAM bitflips after the data has already been read into RAM and validated.

[1] https://ieeexplore.ieee.org/document/9251942