Half and Half and Half

I saw a woman the other day who was half black and half white. She was born that way but then she also had Vitiligo. That condition that causes depigmentation of the skin in patches. Besides that she also had a very full beard. We like to categorize because it is easier and we don't have to think or question. This is called Occam's Razor. The theory that you should always start off with the fewest assumptions first because the simplest explanation is usually the correct one. But there can be so many subcategories. I'm starting to think this theory is razor thin.