What is the point of tinting the moon/pano roof? Isn't that what the cover is for?

I usually use the pano roof for some natural light/air rather then opening the windows..or to look at the sky or something above my car.

__________________
2011 ///X5 M (On Order)

2009 X5 4.8 M Sport Space Gray/Black Fully Loaded

2007 GMC Yukon XL Denali Loaded and Customised