""Your comparison is flawed. Krunner is not a replacement for Katapult, it's a replacement for the old KDE Run-dialog. IIRC Katapult was a third-party app. If the developer of Katapult decided not to port his app to KDE4, that's his choice.""
From the perspective of an end user. Krunner is the only replacement for Katapult. Oh, well, to be honest I should say that it is the only _KDE_ replacement for it, as I now learned about this Gnome-Go, and that Launchy is now available for Linux.
Second, the point with KDE4 is right on the mark, the application is not available anymore due to the fact that that the underlying system forced an application rewrite.
Perhaps you are interested in discussing _if_ and (if it's the case) _who_ is responsible for this. I am not. As a KDE user, what matters to me is that I lost this incredible tool, and was left with something worse as a result of this upgrade. And as I said, that pretty much sums my personal experience with KDE4 so far.
Um, Krunner looks very, very basic. It's just a textbox where you can enter text. Results are then displayed as icons and text. It couldn't really be any more uncluttered.
If you are saying this, I would guess that you never used Katapult, or Gnome-Go for that matter.
Katapult had no buttons, no clickable elements, no text box, no empty space beneath reserved to display icons. Since it had no focus (actually it had one and only one), it would never fail to launch (when the user hit <enter>) because somehow the focus had gone wrong.