It has been observed that finfet devices have lower reliability than planar transistors; it appears that 28nm planar would have better reliability than anything

It has been observed that finfet devices have lower reliability than planar transistors; it appears that 28nm planar would have better reliability than anything Apple is making now. Of course, the CPU would be larger and perhaps less power-efficient. Higher reliability also might not be a design goal, as there is no reason to outlive the term of software support.