Who will make the SoC if not the proprietary chip maker? ARM does not make this thing better.
I guess my point is that the market would punish anyone for being foolish enough to do that in the form of competitors without egregious backdoors. Whereas with Intel... it is hard if not impossible to design/make competitors (AMD being possibly the sole exception)
And yes, I am willing to trade in performance, for more security. My MacBook should be every bit as power conserving as my iPhone, perhaps with a GPU for multi screen and playing videos.