"State of the Art" desktop GUI essentially provide next to no benefit for the end user. Most people use their GUI only to launch their browsers but those who launch multiple application, search for and move around file and similar stuff can use any GUI from the last twenty years quite easily for the purpose - Windows 101 idiocy or Gnome Shell or whatever Kiosk interface might be faster to learn but a person only has to learn to use a given GUI shell once in their life but then they have to surfer it's inefficiencies, it's advertisements and updating every day or every inconvenient period. Of course, few users take action to stop time-wasting interfaces for the same reason few users learn to touchtype.