Couple of points here:
- Apple is about to ship a new mac os that comes with improved support for running ios/ipados applications as well as using an ipad as an extension of your screen.
- The reason for the Mac Pro and the Mac Book Pro to exist is to enable professional artists, developers, and other people that need this kind of hardware to do their thing. Mostly they use tools not developed by Apple. E.g. Adobe is king for anything related to graphics. There are a bunch of third party 3D tools out there. Same for video. Same for Audio. Porting all of that to a new processor architecture will take a lot of time. It also has a severe risk of alienating developers and users during the transition. E.g. Adobe took their sweet time launching optimized versions of their tools for Intel ten years ago and meanwhile some users moved to Windows.
- Mac developers targeting intel macs (i.e. all existing macs), would probably want to develop and test on the machines they are actually targeting. Building cpu/gpu intensive x86 software on an ARM architecture with an X86 emulator makes no sense. You'd want the real thing. Xcode on arm would be a hard sell (except for IOS developers).
- A key money maker on IOS/IpadOS is the app store and the whole point of an ipad is that all the software comes from there. The whole point of Mac OS is that pro users get a lot of their software outside the app store.
- VR/AR is slowly starting to happen and Apple has mostly ignored this on mac os and only done a little bit on IOS (AR mostly). Any hardware that Apple is going to launch here is extremely unlikely to involve Intel or AMD hardware. In fact I suspect this is the primary reason Apple has not pushed hard on this on mac OS: they are looking to disrupt this space with an Apple product that consists 100% of Apple hardware and software and are not interested in filling the gap short term by depending on third party hardware.
So, a processor architecture change on mac os would be short term disruptive and risky. They have a coherent strategy for getting mac users to buy an ipad and double dip in revenue and it seems they are pushing a lot of users toward that platform. Also the pro market is comparatively small but extremely lucrative in its current form.