I highly doubt it's a fanboying issue, they're a small company with big challenges and supporting multiple platforms is not easy at any scale. They also wouldn't want to say anything positive or negative that could sour relations with AMD or other partners in future.
Indeed, but considering that Ryzen 5000 was better than 11th gen and Ryzen 6000 is better than 12th gen the solution is obvious: AMD only.
I think one thing to keep in mind also is that for whatever reason, 10 months after launch, the number of Ryzen 6000U laptops I've ever seen advertised for sale I can count on one hand (I was watching all year, I would have much preferred a Ryzen 6800U laptop!). Currently, only the Asus Zenbook S 13 and Lenovo ThinkBook 13s are available in retail stores in the US (Amazon and Newegg, respectively). In the EU, Geizhals search turns up exactly 1 6800U model (Lenovo Yoga 7 14ARB7). [3] Personally, I'm not convinced Ryzen 6000U ever actually shipped in quantity...
[1] https://github.com/FrameworkComputer/Mainboard/blob/main/Ele...
[2] https://github.com/FrameworkComputer/Mainboard/blob/main/Ele...
[3] https://geizhals.eu/?cat=nb&xf=6751_26&asuch=6800u&bpmin=&bp...