Apple's doing a curious thing from a customer perspective. Their *useful* hardware is getting more and more expensive - over £2K for a good 15" MacBook pro! The more 'affordable' machines are not particularly powerful. It seems to me that they're just interested in making playthings for the rich.
They need to open up their system, to get more people into their ecosystem. Having more and more machines that are very expensive doesn't sound like a good way to do that. It would make much more sense to sell MacOS for use on ordinary PCs, as a way of hooking people in. They'd make money on the OS, and they'd make money on people joining their 'ecosystem'. They can continue to sell high-end hardware as well.
The problem apart from that is that by going over to ARM, it makes macs more and more like 'ipads that run MacOS' - only apps from the app store will run natively. It's basically an iPad running a desktop OS.