WOW, an x86 CPU will be able to run code that's been running on another x86, this Cerny guy has to be a fricking genius! Oh wait, that's what PCs are doing for decades, but as always consoles have to pointlessly overcomplicate even the most obvious things...
You're obviously trolling, but I'll bite anyway.
Consoles are highly specialised machines, whereas PCs are far more generalised. I don't know why the actual x86 instruction set hasn't been used by Sony up until now, but remember that the original Xbox DID use x86. They changed to PowerPC because it met their requirements better - it costs less, had lower power consumption, had lower latency, and ... yes, it was just better for what was required of a games machine.
https://en.wikipedia.org/wiki/Xbox_360_technical_specifications
The PS4 has a crap load of custom chips in it to handle specific tasks (such as zlib decompression). But if you want to go with a real comparison, consider what would happen if you decided to put Spider-Man, H:ZD, or GOW on a PC.
Think you'd get those games in 5.5GB of memory (both RAM and VRAM, because it's shared)? I'm talking same resolution and frame rate here. No. No you wouldn't. A PC version of those games would likely have an 8GB RAM minimum, plus 2-4GB of VRAM, specs far outstripping the console counterparts.
So, yes, there is a reason for the madness of not just using an off the shelf Intel or AMD chip (and even the ones in the PS4 and Xbox One aren't, because they've had all kinds of things done to them to meet the requirements of the systems).
When you look at it, the PS4 was an absolute bargain launching at £350 with those specs. You couldn't build a PC with those specs (yes, including the Blu-Ray drive), and that form factor for the same amount of money. And Sony were even selling those at a profit.
So, yes, everything that Cerny does identifies the man as a genius.
And if you think he's not, as your clear sarcasm demonstrates, you go and build a dedicated gaming machine with all the PS4 gave us, for the same costs, form factor, and all. I'm quite certain there will be a job for you at Sony, MS, and Nintendo when you bring the thing to E3. Just try not to make the housing melt if it runs too hot.