Besides the lack of OLED display, the limited RAM on AMD laptops is another showstopper then. I want a minimum of 64GB ECC, which I can get on a Thinkpad with an Intel Xeon CPU.
I have one - prime offloading works exactly the same as on Intel. As far as external displays it's very simple, when I plug one in it is owned 100% by the NVidia GPU. Which is not an issue because I have access to AC.