For me, I use unraid because I have a consistent need to continue upgrade disks and I really need to be able to do it adhoc because I can't afford to replace 24 disks at a time and don't want to fight with multiple zfs pools. I was actually planning to go to a new unraid server with 36 disks and have a second pro license. I just finished removing all 8tb disks and will be replacing the 10 and 12tb with 22tb now.

Now I might have to use truenas or something as an intermediate so I can reuse my existing license.