Please see the reddit discussion -- there's some great feedback there on this very point, and some experienced contacts actually think I didn't go far enough, better results at even more than 16k as long as you can control write amplification and fragmentation.

- https://www.reddit.com/r/zfs/comments/rjavyc/everything_ive_...

- https://www.reddit.com/r/zfs/comments/rlfhxb/why_not_txg_tim...

- https://www.reddit.com/r/PostgreSQL/comments/rlrvt1/what_hap...