Actually existing Macs sort of have both, given they include the T2 chip which contains the same ARM cores that were in the iPhone 7. It's actually not the cos

Actually existing Macs sort of have both, given they include the T2 chip which contains the same ARM cores that were in the iPhone 7. It's actually not the cost, though having two functional CPUs would cost more. How would it work? How much time and effort would go into building the hardware so they could interoperate and the OS to make it usable? Just a massive amount of complexity for very little gain. Apple's Rosetta2 will already run x86 code with very good performance on Apple Silicon, in MacOS as a MacOS app. Hundreds of dollars per Mac cheaper, and far less complex to integrate.