It's main core *thing* is that it has a fairly large set of libraries and a core that everything else builds off of. This means that its current build is pretty low cost (since it loads a small set of dynamic tools), but it also means that it doesn't play well with others.
If you try to install a single game from the KDE Games toolchain, and you're basically getting their full suite. And then it's gonna try to help *constantly*, and it's just going to be hard to use.
I am a dwm person at heart though, but only with my 10 years of personally homegrown patches.
So... uh, definitely don't go to me for advice.