While it's not quite as high speed as DDR4, I've designed some simple PCIe board with KiCAD (OCuLink to PCIe x4, M2 A+E to 2.5GbE). It does require some hand-holding though.
I may be missing some nuance and/or perspective here, but is this truly an issue? I've used Dell, HP, Lenovo/Thinkpad, and most recently Framework laptops over the last 15 years, and only one of them offered an out-of-the-box Linux experience. _All_ of them ran Linux (ArchLinux and Fedora) fine if I installed it myself.
Is the concern surrounding having to install Linux yourself (valid concern), or around vendor support (subtle BIOS issues, lack of trackpad support, etc)?
Edit: Emphasizing my "fine" experience with Linux.
You refer to the killing of scientists, while the parent comment refers to the killing of activists. Please do try to avoid the bending of words, intentional or otherwise.
Edit: Completing comment