Every user interface gets this way!
It seems that all user interfaces o from "simple to use" to more and more complex as time goes on. It isn't that KDE does this, it seems that all of them want to be fancier and fancier as time goes by. The original Mac interface has gotten more and more complex. They added such things as color and animations then stuck the app dock (yes you can even configure it as well). Windows suffers as well, with its latest incantation (TIFNAM) which is all about being flashy on phones. In the Linux world both Gnome and KDE suffer form this growing complexity/featureism which seems as a way to distinguish from one another (usually failing in the process).
It happens in other ways as well. Just look at automobiles. Have you tried to order one recently? There are options from A-Z and more after that. The game is to distinguish from one another and as long as there is competing ways, featurism and customization will be the norm.
Oh, well. One modem for everyone, as we are all different!