Totally. We are driven to look for beauty, form, symmetry in nature, and assymetry for interest. IMO a bad wallpaper could turnoff a potential new user if it has that janky feel. Zorin and Elementary seem very polished because they took the time to start with clean wallpaper and polish the UI. And I realize Ubuntu is a good distro but can you imagine recommending it to a C level exec and their first look is a faceted pather looking thing that seems like 90s tron vector graphics. Similarily Pop!_OS is great but some dude is going to see a minimal colour posterized robot scene and think is this on OS for kids? Don’t get me wrong I love posterized art, but not everyone does.