I honestly don't like CSS interfaces. They have a way of rendering as-they-load, and it looks unnatural to me for a native app. But even without CSS, Qt has a special way of rendering. It's the main reason why I don't like KDE. I kind of see it rendering things one by one, even if it's in a split second. It bothers me. I much prefer the way things render on pretty much any other toolkit or OS. It's kind of "there" all at once.