> Competition with "mature nodes" is different in the sense that here one company (like TSMC) will be "competing" with itself.
No, why? Lots of foundries out there that don't compete on leading edge nodes.
> Apple can't increase the price of their product arbitrarily. So if the price per performance increases, the new iPhone would be slower than the old one. Maybe people will still buy it if it has better power efficiency, but that is a trade-off which has its limits.
That doesn't address what I said -- that price per transistor is not the single limiting factor. I never said any performance increase is worth infinite value.