My £0.02
I find the exclusion based on scalability potential to be arbitrary, unhelpful, and a bit silly. What buyer looking to acquire 100TB of capacity would avoid looking at a given 100TB array because it could potentially be expanded to more than 500TB of capacity?
"How big can this thing get? Well, that's just too much future proofing for me. Good day and goodbye!" :-)
(No need to respond, Jerome - your position on this has been made clear via your comments to date.)