Except that the problem with Nepomuk was that, on anything but the latest hardware, it made the system unusable.
Defaulting to an unusable system? WTF!
Okay, if I will run it on an Athlon t-bird, but I came across plenty of reports of boot times measured in tens of minutes, and occasionally hours, when some poor sod didn't realise his "upgrade" had activated Nepomuk. How are you supposed to recover your system if it's taking eons to boot?
I can't remember how bad it was for me, but I can remember struggling to disable it to get a usable system back. I think it might have been enabled again by now but ...
The main excuse by the developers for enabling it was "but it'll make using kmail faster..." - another WTF moment! How many KDE users run kmail? I've NEVER used it - why should I want an app on my system enabled by default who's *only* effect on my normal work is to slow it to the speed of frozen treacle?
That said, I've stuck with KDE ever since SuSE 5.x, although I've now got xfce and lxde installed as well - lxde looks nice ... :-)