Ok, what I am hearing is Nixos but with an installer like this
Rufus ISO to usb stick stick usb stick into computer press magical button to boot usb <-- this should be the most difficult part of the process Screen appears, least amount of text possible Ask only the important questions, on a single screen
then one last big scary page "this will erase everything on your computer"
Check "I understand" then press"ERASE BUTTON" (or cancel and reboots)
then it reboots and everything your average grandmother needs right there a google button an office button and that's pretty much it