Why is the userland so bad in comparison? are they employing much worse developers to take care of the windows explorer/search/browser side of things? it is true that if you really try to pay attention you will notice many quirks and bugs here and there in the user interface interactions, with the start menu search being such a horribly visible offender (also bugs in the explorer search box).
Microsoft managed to make a uniform looking user interface for both win9x and XP/Vista/7, why are they having so much trouble with Windows 10 control panels?