True, I don't do any laptop gaming. Intel GPU's seem to be sufficient as long as it can easily power a full HiDPI internal monitor + 4k external monitor... which Librem's Intel 620 GPU is listed as supporting but it looks like Librem's 15 v4 only has an HDMI port and not usb-c/displayport, which limits it to 4096x2160@30Hz instead of 4096x2304@60Hz. So I guess you'd have to look at Lenovo, HP etc for top tier..
Sadly my work uses all Macbrook Pros, which are amazing machines), but I'm scared to install Archlinux on them. The Archlinux Macbook wiki pages are 4yrs+ old.