Well you may be surprised to know that Jeff Wilcox, the key architect for Apple's M1 chip and Apple Silicon transition left Apple for Intel earlier this year >
https://www.macrumors.com/2022/01/06/m1-mac-engineer-departs-apple-intel/
and the same went for a few others (including two for Qualcomm and Microsoft on chip design). So I am assuming we may see a return-to-form for the likes of Intel and Microsoft with these top ex-Apple engineers onboard. With them around, we may likely see much more efficient chip designs from Intel in future.
Whilst they may not seem to matter to the Mac world to you, Intel does and still plays a huge role on tech infrastructure worldwide and to a certain extent, the Thunderbolt and PCIe interfaces they developed. I think Apple trying to knock Intel out completely from their ecosystem may actually jeopardise future TB and other hardware development for Apple.
On the other hand it must be pretty bad for Apple to be losing so many top-level engineers in such a short time span.
People leaving at such a rapid rate doesn't bode well for development especially morale and stability when you are trying to keep things on track and on a levelled schedule.