It matters when you want to evaluate whether a group has gotten a bad deal in society.

For example, if girls tend to prefer playing with dolls instead of toy cars, is it nature or nurture? If nature, then maybe there's a biological basis for why less women go into stem. If nurture, then maybe it's society's norms and expectations that explains why women more often go into people-oriented jobs like teaching and nursing.

When you look at it this way, you can see why the difference has political implications.