I wonder about this. Wouldn't it be better for your skin to breathe and not have foundation on it for that extra 10 or more hours a day, even with proper removal? Either way, the reason I say sad is that some women want flawless looking skin all the time and feel insecure with any marks or imperfections on their face. It's not just about wearing bad foundation. I just don't get what's wrong with natural skin that's not so messed up. But I guess everyone has their own thing.