Yeah, that's my concern. I want reliability, super reliable. So reliable that I can live life recklessly without a backup. Backup does get expensive, managing, paying, the bandwidth, the restoring.
Increased storage reliability doesn't protect you against data corruption due to software defects or accidental deletion. You still need backups to protect against those problems.
That's the dream, but until you can guarantee the building your drive is in will never burn down / be struck by an earthquake / be broken into and cleaned out, you will need some sort of backups.
shred /array0/important && rm -rf /array0 && zfs list -t snapshot -o name | xargs -n 1 zfs destroy -r