They don't need to make their own CPUs for that. Framework can write its own BIOS and ACPI drivers for Windows and Linux to have proper sleep support. But that's more R&D expenditure they probably can't afford.
For example, for my home lab, I bought a used Intel 12th gen industrial PC from a specialized Taiwanese embedded systems company, whose BIOS allows very granular control of all sleep states plus individual power control of most peripherals, probably because that's a must-have for customers in that space over stuff like benchmark scores and bang for the buck.
So technically, IT IS possible to do, just probably not very cost effective for consumer devices.
Do those settings actually work? My HP laptop with a 10th gen intel has an option for this. Windows manages to suspend, but it doesn't come back to life. Linux is broken, too.
For example, for my home lab, I bought a used Intel 12th gen industrial PC from a specialized Taiwanese embedded systems company, whose BIOS allows very granular control of all sleep states plus individual power control of most peripherals, probably because that's a must-have for customers in that space over stuff like benchmark scores and bang for the buck.
So technically, IT IS possible to do, just probably not very cost effective for consumer devices.