I could do without cosmetics but would I want to? No, I wouldn't.
Like others here, I wear make up for myself, not for anyone else. Some sort of foundation smooths out my uneven skin colour and covers up sun damage. Soft eyeliner opens up my eyes and makes them brighter. I still have decent lips so I like to enhance the colour with lipstick. I like the overall effect. I'm in fact just back from a pre-holiday trip to the beautician, where I had waxing and eyelash tinting done. It makes me look ten years younger and a tad less scary to small children and horses.
People have been decorating their faces since the days of wearing woad, same as people have been doing their hair since time immemorial.