Apple is going to want to entice Pro users over to Arm as quickly as they can as well. It makes zero sense engineering wise to rejigger things for mini-LED for a CPU architecture that you are leaving. I suspect that Apple is further along in CPU design for Pro machines than anyone suspects and that the transition is going to be faster than some want. That said, Apple wants some Arm-exclusive features to help really get people on board and along with new chassis’, Face ID and better webcams, I cannot think of a better enticement than new screen technology with better HDR color, brightness, energy efficiency, et al. Apple is looking at the future, and Intel isn’t it.