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However, I have to take exception to #2 and #3. For Konqueror, the left-sidebar is optional (just right-click it and click 'close'). For Kate, the sidebar and bottom tabs are actually part of the IDEAL UI. Kate is a programmer's editor. For programmers, who have to juggle dozens of files at a time, opening the file dialog for each one is *not* an option. The sidebar offers conventient access to a number of different panels of information in a quick manner. Integration of IDEAL into the MDI system was one of the coolest new features of 3.2.
As for tabs at the bottom, the only app I know that uses them that way is Konsole. It makes sense for Konsole to have the tabs at the bottom, because it is a terminal, and in a terminal, the user's focus is at the bottom of the window, where the newest text is.