Agree, its confusing how it is written now.
Also, its great to have options.
Its a good thing that we both have the unraid-array, btrfs, xfs and zfs options.
And without the array, unraid would not be unraid, just another TrueNAS "clone" that would sit between core and scale.
As I try to tell all the TrueNAS "sellers" out there, TrueNAS is great, but me and many does not like or want that we are locked to zfs.
And surprise surprise, the hard hitting TrueNAS "sellers" wont mention up front that its locked to zfs, basically need identical drives, cant (for now) expand an pool without putting in same amount as drives as existing vdev(s), cant use mixed size drives (unless you make multiply pools).
And if you try to point this out they most of the time just goes "Buuut muuuh freee!!"
(also TrueNAS is not truly free, they too have developers they need to pay just like Lime, but since TrueNAS is an (as far as I know) hard hitter in the enterprise market. they also sell their own hardware solutions, there is where they get the money from. If Unraid had been a hard hitter in enterprise marked, Lime had sold their own hardware solutions etc, Im pretty sure Unraid would have been free for private use too.)