They also said this doesn't apply to consoles, but current and last gen consoles are also x86. So it's still not clear what they were referring to.
And the changes Intel is proposing would just remove some steps in the boot sequence and unused modes/options that only exist to maintain an interface in common with ancient hardware (and associated motherboard FW and OSs). There's nothing to indicate it would improve performance, or that maintaining this compatibility until now hindered the hardware. Assuming this is what you are referring to:
https://www.intel.com/content/www/u...visioning-future-simplified-architecture.html