There are very real reasons to use ZFS instead of the oldschool Linux block device sandwich.
mdadm+luks+lvm still do not quite provide the same set of features that ZFS alone does even without encryption. Namely in-line compression, and data checksumming, not to mention free snapshots.
ZFS is quite mature, the feature discussed in the article is not. As others have pointed out this could have been avoided by running ZFS on top of luks and would have hardly sacrificed any functionality.
ZFS is quite mature, the feature discussed in the article is not. As others have pointed out this could have been avoided by running ZFS on top of luks and would have hardly sacrificed any functionality.