I used gnome though. IIRC, everything to do with customising GNOME is done through extensions, and all extensions have GUI settings menus.
My point being, even though it’s objectively harder to customise GNOME, it still doesn’t require using the terminal.
On top of being preinstalled, we also need google search-able instructions that avoid the terminal altogether. People are afraid of the terminal, it doesn’t matter why, it just is. However that would entail different sets of instructions for each DE and lots of screenshots.