Literally nobody wants their files to be silently corrupted. ZFS made it much easier for (nerds like us) to attain very high levels of data integrity.

APFS was (and maybe still is?) a chance to make that the default for regular people.

With TB file systems, assuming you haven't outsourced everything to iCloud, data integrity matters. If you have, now you're trusting them not to screw up, ever.

From the movie or mp3 that mysteriously no longer plays, through to more important things - business data or family photos. I suspect many people have experienced bit rot, even if they don't recognise it as such. We've even reached a point where with quoted drive figures copying 2tb from one drive to another will likely result in a bit flip (source - Ars ZFS+btrfs article a couple of years back).

Heck, most people have some level of data loss from a HDD or flash drive fail. Sometimes even when they tried to do all the right things. Only question is whether it was backed up. In the case of personal users, unlikely. Self healing could have been quite some selling point!