For the same reason they haven't switched to ARM for macOS yet - compatibility. If Steve Jobs was still alive, he would've probably switched macOS to ARM by now

For the same reason they haven't switched to ARM for macOS yet - compatibility. If Steve Jobs was still alive, he would've probably switched macOS to ARM by now, despite all the hassle. He's done it before. I'm not really seeing Tim Cook pull a move like that anytime soon.