Personally, I never found that the pressures written about in First Girl Ever stories were all that relevant to my life. I didn't grow up in the age of "You can't do that because you're a girl," I grew up in the age of "It's an enormous boys' club where everyone makes off-color jokes and people are merciless to you when you make a mistake, but that's just how things are. I guess there are no women because they're just naturally bad at math!"

I think a book like "The Disreputable History of Frankie Landau-Banks" (which IS, though, a First Girl Ever story) talks about the social pressures of being a woman in a male-dominated society in a way that's a lot more subtle and nuanced -- because it's not about the overt pressure, it's about the little things that make you doubt yourself and give up.

I think in stories it tends to be a little boring to see an obvious good triumph over an obvious evil, and it's more interesting to see two good things fight it out. Make it more interesting than "girl triumphs over evil ignorant sexists," because that's not how things work in my life anymore.