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It's appealing to parents who believe that boys and girls are different, i.e. most parents who have both boys and girls. Don't worry, many of those parents will still let their girls play with trucks and won't get bent out of shape if their boy wants to play with a doll. I could (and did) play with whatever I wanted, and so could my brothers, and so can my niece and nephews. But my niece and I can dress up her dolls for hours without getting bored, and my nephew plays with trucks. Go figure. It's possible to believe both that there are different brains in there AND that individual differences will put many girls and boys in the same play space.