The minor UI/UX differences between Windows and say, a distro running KDE or XFCE isn't any greater than the difference between two major Windows versions. I mean, look at Windows 11, a lot of normies were unhappy about the center oriented taskbar. And look at the mess that Windows 8 was - no start button initially, and a fullscreen start menu.
The proof in the pudding is the relative success of Chromebooks - normies buy it knowing that all they need is a browser, and they didn't need to take any big effort to learn anything new.