I don't mean to imply NAND flash never had ECC. Just that the early flash had needed maybe 1-3 bits of ECC and I would never see an 1-bit error until maybe a fe

I don't mean to imply NAND flash never had ECC. Just that the early flash had needed maybe 1-3 bits of ECC and I would never see an 1-bit error until maybe a few months of use. Things were a lot easier back then. Scrambling and read disturbs were not a issue until later on. All the things you suggest can be done. Just so many opportunities to screw up in the implementation despite the best efforts.