I think the biggest advantage of this particular system is openness. As the linked page says, you can modify any piece of code in the system, including CPU mic

I think the biggest advantage of this particular system is openness. As the linked page says, you can modify any piece of code in the system, including CPU microcode. That means no secret operating system running somewhere you can't touch (i.e. Intel Management Engine), and no opaque blobs that could be doing anything.