Intel chose and stuck with backcompat as a strategy. They could, tomorrow, split their designs into legacy hardware and modern hardware. They didn’t, but Apple has done breaking generational change many times.
Apple also has a particular advantage in owning the os and having the ability to force independent developers to upgrade their software, which make incompatible updates (including perf optimizations) possible.
Intel also wanted to break backcompat and start fresh with Itanium but it failed.
So they abandoned it. Meanwhile Apple has powered through that problem how many times?
The price of Apple’s approach is that 3p developers have to dance to Apple’s tune. And that’s a tough road, as evidenced by the small set of really successful companies which have bet the farm on Apple.