I think about this sometimes. What stuff can't you do in a Linux GUI that an average person would be able to do in Windows? For the sake the simplicity, lets limit the GUI to Cinnamon, Plasma, or Gnome.
Obviously, there are obscure GUIs out there, but in the main ones, I think just about everything can be done without CLI.
I don’t think this is accurate. It says Apple is the leading phone where I live, but the large majority of people here are too poor for an iPhone. Plus you rarely see people with them outside the rich areas of the city.