We're showing kids a world that is very scantily populated with women and female characters. They should see female characters taking up half the planet, which we do.
When my friends and I would act out movies as kids, we'd play the guys' roles, since they had the most interesting things to do. Decades later, I can hardly believe my sons and daughter are seeing many of the same limited choices in current films.
It's really important for boys to see that girls take up half of the planet - which we do.