@lproven @theregister Ah, FreeBSD 14.2 shipped with OpenZFS 2.2.6 and some subsequent fixes
FreeBSD main (aka CURRENT, and what will become 15.0) picked up RAID-Z expansion in 2023 https://cgit.freebsd.org/src/commit/?id=e716630d4cf89e69ec3f675ebfceee09f1a85e05 and updated to OpenZFS 2.3 in Oct 2024 https://cgit.freebsd.org/src/commit/?id=7a7741af18d6c8a804cc643cb7ecda9d730c6aa6 with additional fixes after that.