"Could Pure go in full-scale pursuit of Nutanix? It's not that inconceivable is it, Pure being such an ambitious company?"
The interesting part is the use of the chassis as shelves. They mention 28 modules which you can see at the front....but they don't say whats at the back. Assuming they still have the servers at the back then yes; they can add servers in two unit increments...or just add capacity as needed and servers later you want.
Scale out compute and storage independent of each other, NVMe/F connected.
Does anyone know who manufactures their current capacity shelves?