$4000 is… a lot. I can buy a used CSE-846 for about 1/4 of that, an X10–era mobo for a few hundred bucks, and have 1.5x the bays (tbf, also 4U instead of 3U). Managing ZFS is just not that hard; it’s not Ceph. If you want easy mode, throw TrueNAS on it, and you’ll get an awesome UX that abstracts away everything difficult.
If this were < $3000, I’d probably buy it. I’ve been holding off on replacing my two CSE-826 because I’ve been waiting for this to come out. Disappointing.