So I bought one of these cases. It's for the macbook pro. But ALL the cases I find all have this... See how the back cover has all those holes and air vents? Um why? My mac has no openings or air vents and from what I can see most don't. So why is it there? Did I end up ordering the wrong thing? Why does the back part have all the air vent and openings when there is no need for it?