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I have rather nice experience with ZnapZend https://www.znapzend.org/
Only issue i've found is the fact there is no official Debian repository and i always do forget to recompile it after upgrading Debian :-D
I really like the configuration system integrated in ZFS set/get...
There are definitely annoyances, but there are workarounds too; you can add additional vdevs to expand the whole pool if you want, and data is striped across them; it even lets you mix and match different raids if you really want to for some reason.
There's some current work to add a disk to existing vdevs, and I think even a semi-working PR for it now: https://github.com/openzfs/zfs/pull/15022. Hopefully in theory that will make ZFS a little less frustrating.