Rescuing home partition from ZFS, actually that doesn't really count since I did have to reinstall (was no longer booting), but recovering the Home partition from ZFS and to the other ext4 drive was much harder than it should've been and that's why I would never recommend people use ZFS.
tell me, please, who thought it was a good idea for a filesystem to remember the last machine it was mounted from and refuse to let itself be mounted by a different operating system instance even if all the hardware is present?