I've never seen anyone aside from devs running a linux desktop device, so while I'm not saying this can't be right, I am a bit sceptical. For an average user, Linux can still be quite challenging to use as their main OS.
I'm a KDE aficionado for good reason. I put a few large icons (KDE allows you to scale your icons really well) on the desktop, with a pretty wallpaper, that have easily understandable functions, that are locked in place. The ability to lock the desktop layout is a killer feature that I do not see available on Windows or Mac or most Linux WMs.
Obviously, it does help that I'm an IT Consultant but "For an average user, Linux can still be quite challenging to use as their main OS." No it doesn't need to be so. The KDE Plasma UI can be made very simple or unbelievably complex to suit the required UX.