nodq It just did not boot to the login screen whereas lightdm did tho.
Could you clarify what you mean? How did it work yet simultaneously not perform it's primary function? In terms of your other issues, those are "normal" (gkr-pam daemon control file), but I'll have @DataDrake tinker with PAM when he has some free time.
I narrowed down the issue with the Wayland support in GDM, which I've disabled, likely permanently (sorry those that for some reason want to use Wayland, it's literally breaking the desktop for everyone else so it's getting the boot). In my testing, setting it to VT7 with disabled Wayland support still allowed my reproduced GDM install to function. I researched what other OSes are doing and most of them are keeping the odd VT1 default, with some exceptions (namely openSUSE and NixOS, neither of which are really of any consequence tbh).