This should be a well know, but often misunderstood thing. Lots of reddit selfhosting threds urge people to buy a new mini-pc for its “low power draw” when usually its the same or 1-2watts less then a laptop from 2012. However performace to watt is much higher, so if you need massive preformance new is much better, if your system is idling most of the time anyway, basically no diffrence in buying old

The thing about Guix (and Nix) is that there doesnt need to be a package in the repos. You can either make your system automatically compile from source (which is how many AUR packages work) or use something like distrobox, bottles, flatpak to run extra software

Had the same problem on fedora (no issue on bazzite, nobara, or arch). First time it was xwayland that kept crashing without a display present for some reason, second time I never solved since I was distro hopping the fedora family of distros but it seemed to be a problem with SDDM