You can remove that, if you are good with Windows you can clean up that pretty much. The problem with Apple is their UI bugged, stupid bugs and lack of decent UI like grid Windows and more features that just Windows has by default, and KDE has even much more. Pretty stupid to pay for an Apple.
Well, Linux is already on the desktop. I don’t know what the blog mean.
About Wayland, it still need time even if people says it’s ready and blabla, I even had issues with Flatpak+Wayland so… keep on X11 to make sure all works.