I tihnk that's just a symptom of how FOSS devs think about GUIs. GUI is largely not something FOSS developers actually use. The design of FOSS GUIs makes it seem as though "GUI" is something they've read about in text books and personally only see value in as a fancy tmux. Consequently, the only mental model they have for someone who actually uses a GUI is the kind of person who only needs a web kiosk.