I never thought much about it until now, but accurately proportioned dolls are uncanny and creepy. I wonder if that's why Barbie wasn't accurately proportioned to begin with.
I think the problem with girls toys is how they are promoted to be played with. The point of Barbie is to make sure she looks pretty, regardless of the dolls initial proportions. So little girls are taught to focus on appearance and making sure things are visually appealing as possible (including themselves).
I don't mean you call you out, but you should note that comments like this are essentially exactly why this project exists.
Perhaps if kids grow up playing with realistic toys they won't think they are uncanny.