Scaling from the 8U (that blades could already do in the 90s) to full rack as the unit of "slide unit in to connect" DC power and networking is way cooler than using 80mm fans.
Re UEFI: I feel like that part is less about UEFI itself and more about how you have very minimal third party firmware.
I'm pretty excited about openSIL and such in general. If only AMD could execute well in the world of software.