I would posit to you that it is, in fact, the perfect amount of complicated. If I want to change something, I don't have to program and/or install an extension that will get blown up on the next release of the desktop environment because of the lack of fucks that Gnome gives for people that build extensions for it.
I will concede that it would nice to have dconf. But considering the amount of stuff that can be configured in stock Plasma, that might take a lot more than the 3 settings that Gnome allows you to change.