Can only speak for myself but the problem is that with KDE there's always stuff I need to go in and change because I don't like the defaults, and then I fall into a rabbit hole of endless tweaking from which it's difficult to escape because no matter how much time I spend I can never get it to be just right.
Funny I feel the same about gnome. I haven't played with others enough to comment I suppose but all are missing some basic creature comfort stuff like a full tcp/up config dialog or a real fluid working app store out of the box. Distros add these but what is going on here.