Fair enough. Microsoft is demanding no ARM-based platform running Win8 can have their locked-down boot mechanism disabled. In other words, Microsoft is demanding manufacturers make machines that can only run software Microsoft allows them to run.
Or a market opportunity. Hard to say -- in many respects, the standardized PC is a fluke, created through clean-room reverse engineering and the resulting clone market.
Nicely put. Also, another huge factor in the standardized open PC was Microsoft licensing DOS to Compaq. That triggered the PC clones and the PC revolution which Linus leveraged with Linux and then Apple a decade and half later.
Sounds like a really boneheaded move.