Re:I just don't get it (Score 1)

The MacOS and Windows UIs have plenty of inconsistencies, even in those applications that come from the OS vendor itself. The Interface Hall of Shame picks some of them apart. Have a look at some of the applications that supposed HCI experts at IBM and Microsoft are producing. And that isn't even counting all the Windows and MacOS apps written using cross-platform toolkits that differ substantially from native apps (often, they are actually better than native apps).

X11-based UIs aren't perfect, but on the whole, they are no worse than the commercial stuff. And whatever problems GUIs like Gnome and KDE have aren't the responsibility of X11, which is merely a windowing and graphics library (roughly like Quartz).