1) Windows updates are not released daily, when a problem/bug/vulnerabilty arises it is forwarded on to the applicable team, the team works a solution and depending on the severity of the flaw is tested for a certain period.
1a) Open Source flaws are generally fixed far more often as they are collaborated by a world of enthusiasts all adding their little bit right there right then as they are discovered.
2) The REASON the kiddies attack Microsoft is because they ARENT open source. When all the see more information is given to you up front, society in general is far more accepting than that of what goes on behind closed doors. These "blueprints" you speak of doesnt stop the fact that flaws are found and abused.