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Or how after they do a writer failover, they start seeing duplicate data.

PostgreSQL does not use SEEK_DATA/SEEK_HOLE so they're ok

Ok, I'm out of the loop, whats the problem with zfs here?

https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu... the mean time between corruption article on zfs is two years

Looking at your search results, there's just one recent ZFS corruption case with SEEK_DATA/SEEK_HOLE (in several HN reflections), a 2-year old Ubuntu-only buggy patch story, and some 2008 [Open]Solaris corruption.

Most of those links are about bad memory. If you blame bad memory for filesystem issues I don't really know what to tell you. Ignoring the poor state of the native encryption code, ZFS has had 1 corruption bug in like 10 years. Thats one of the best records for modern filesystems. I still wouldn't trust my data to btrfs by comparison.