In some ways X11 with it's focus follows mouse, don't raise on focus, select:middle click paste features provide a far more refined desktop experience then mac or windows ever could. No wait, stop laughing, sure X11 was a garbage fire when it came to consistent professional design, but because it was such a wild west of an environment there was place for real ui innovation. I know, I get grumpy fast without middle click paste. And I hate having to raise a window in order to click and type on it(A common access pattern for me is to read docs on the top window while I am operating the bottom window).