The early 201X's were an interesting time. Ubuntu had just landed and was winning new Linux users by the tens of thousands with its easy and intuitive desktop. Then things like GNOME 3 and Unity started landing, things that tried to turn every computer into a tablet with a keyboard.
KDE had some bad-ish times too, but it's still been my daily driver because it looks and acts like a desktop. It is optimized for devices with an upright screen, and a physical keyboard and mouse. Apple and Microsoft would do well to emulate this.