I think ZFS would still need some work to be a good consumer filesystem. Most notably, they would have to remove the restriction that you can't expand a pool b

I think ZFS would still need some work to be a good consumer filesystem. Most notably, they would have to remove the restriction that you can't expand a pool by adding devices -- the way you have to do it now (swap in a larger device for one existing device, resilver, and repeat) is just a non-starter.