I'm not sure it really takes that kind of breakthrough approach. Apple chips are more energy efficient, but x86 can be much faster on CPU or GPU tasks, and it's much more versatile. A main "bug and feature" issue is the PC industry relies on common denominator standards and components, whereas Apple has gone vertical with very limited core expansion. This is particularly important when it comes to memory speed, where the standards are developed and factories upgraded over years at huge cost.

I gather it's very difficult and expensive to make a board that supports more channels of RAM, so that seems worth targeting at the platform level. Eight channel RAM using common RAM DIMMs would transform PCs for many tasks, however for now gamers are a main force and they don't really care about memory speed.

Makes sense: M-chips, Falcon-9, GPT's are product subsets or the incumbent's traditional product capabilities.