> Is there anything they're doing that can't be replicated by hypervisor/management software on commodity x86 servers? Seems like their "secret sauce" is a software stack that "just works" more than any actual special feature of the hardware.

There's a reason Apple is consistently one of the top 5 most valuable companies. It isn't because their hardware does anything that can't be done on "commodity" hardware, its that they built a software stack that "just works" and part of that was tight coupling to the hardware.