3) You don't understand the ZFS concept and in fact how RAID works in general, or else you would not mention that. You CAN expand arrays. Many people are looking at Drobo and other similar crappy products and expect to have a robust product like ZFS working that way. Ridiculous. And I say this respectfully, kashiwagi...
Respectfully? I think we might have different ideas of what respect means then. I understand perfectly well how both ZFS and general RAID works. Please explain to me how I expand from a 5 disk RAIDZ2 to a 6 disk RAIDZ2 (yes, I am being facetious). I chose ZFS knowing this limitation, and I am not really faulting FreeNAS for this (which I explicitly mentioned). I know I can replace smaller disks with larger disks and the volume will grow, and I also know that I can add new vdevs to the volume to grow the volume (which is useless in the use case I specified above).
Just because I would like to have the ability to grow my home NAS from 5 to 6 disks, I don't understand RAID or ZFS?
I specifically mentioned nappit, so instead of saying it "Is the same freaking software just a tad delayed. If you don't need a GUI and delays, run FreeBSD.", maybe you could let people who have valuable input post instead. I was hoping somebody had actually made a proper comparison (preferably tested both), and that they might have some insights into benefits and down sides of for example FreeNAS over nappit (since I can migrate my ZFS volume to freebsd or solaris with nappit).