Framework doesn't produce it's own CPUs. It buys them directly from Intel. Producing your own CPU is really difficult, if you want it to be competitive with other state-of-the-art CPUs.
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.
https://community.frame.work/t/responded-how-to-enable-s3-sl...
https://novacustom.com is a manufacturer that does do their own firmware and BIOS and gives you full control over all these settings