Also they probably have to consider how much money they're willing to throw at this. Switching to ARM on macOS will save them money as they don't have to pay I

Also they probably have to consider how much money they're willing to throw at this. Switching to ARM on macOS will save them money as they don't have to pay Intel and can reuse existing designs and relationships with TSMC. But actively investing money and personnel to support Windows, NVIDIA and AMD GPUs, virtualization, etc on a platform that sells 20ish million units in an year, compared to the hundreds of million of units that iPhones/iPads/Apple TVs, etc sell - probably doesn't make financial sense. Especially with how they've treated macOS lately, enabling easy transitioning via Catalyst, SwiftUI support, making it easy to reuse code for iOS. Switching to and getting more revenue from services, thus them being a bigger priority. And there's the argument of doing all of that instead of investing more time into macOS with the whole Vistalina thing going on. Again no idea whether it makes financial sense, they've more than likely done the math and it'll be interesting to see how it plays out.