I thought RISC chips are easier to create in a more power efficient way as the chip design is way easier than for CISC (like x86)? If Apple had been able to create a competitive x86 chip they would've done that. But the instruction set is an extremely important part of that.
Apple simply can't create any kind of x86 chip whatsoever (at least if they plan to use it :) ) - they don't have an ISA license and likely won't ever be able buy one, because Intel doesn't sell.
Well, apart from outright buying AMD. Or Intel. Or both. :)
So you basically say it's not hard to design a processor (even x86), just patents prohibit it? I had always thought that at least some part of the Intel/AMD dominance was the complexity of the designs and manufacturing that even a company like Apple couldn't build within a decade.