Then there's an icon telling me that I have pending updates. Except I don't - I update my system using "apt-get dist-upgrade" and KDE doesn't understand it.
Then there's a problem with shortcuts - I can't change their icons. So shortcuts for bash scripts on the taskbar all look the same.
Then there's a bug with taskbar positioning - I put it on the top of the screen and KDE stubbornly places it in the CENTER of the screen during the startup so I have to drag it back to the top each time I reboot my computer.
...and so on and so on....
KDE just isn't polished. And why would it need to be polished? After all, only its developers use it to fiddle with all the semanticy thingies.
My taskbar doesn't work correctly, but I can share it on the network so other users can access it remotely.