A distro relying on an out of tree filesystem as default sounds like a really bad idea to me. I didn't know Ubuntu shipped with ZFS in the default kernel.
Also luks and btrfs are good enough, and in-tree. They might not be as fancy as ZFS, but it's a better choice to use as default as they're standard and widespread.
Also luks and btrfs are good enough, and in-tree. They might not be as fancy as ZFS, but it's a better choice to use as default as they're standard and widespread.