KDE is by far my favorite computing environment, but its default settings slow its adoption, I believe. For example, the default task switcher is overly complicated, and even worse, in some distributions, an actual extra package has to be installed to just get a useful and basic switcher. I believe, more than anything else, if KDE wants to get more users, it should urgently work to make its default settings less surprising to new users, despite its ability to wow with neat (but not necessarily useful) user interface effects.