As a ASUS fanboy, I've been feeling severe buyers remorse and guilt ever since I bought my Asrock fatal1ty gaming. After reading this, It all magically vanished. Closure is bliss.
With three SKUs having an SFF-8643 port onbaord maybe ASUS is promoting U.2 with a plan to release a 2.5" PCIe NVMe SSD under its own brand or something. Like a sequel to their RAIDR SSD.