Personas, and the Hallfight cutscene.
If logic held they'd both be 50/50.
If logic held they'd both be 100/0. But computer games are seldom entirely logical.
We have to work with what we're given.
Excuse me?
Women aren't uniformly better pilots than men (which is I hope what you're suggesting), and men certainly aren't uniformly better infantry (though they mostly are.)
You need to think through the larger social implications instead of the narrow focus of whether a man and a woman are equally capable of performing a particular job.
At the time FS1 begins, the Terrans and Vasudans had been involved in a grueling war, with no end in sight, for fourteen years. The war had the perceived (if, perhaps, not real) threat of annihilation, or indefinite subjugation, of the losing side. Then the Shivans came along and started blowing ships up left and right, and glassing colony worlds, and annihilation started
actually happening before everyone's eyes. By some miracle the Shivans are stopped and disappear for 32 years, but there is constant vigilance for when they might come back. Eventually the Shivans do return, and not only do they pulverize an already-weakened fleet, they obliterate an entire star system.
So in all FreeSpace eras during which the games are set, there is a widespread legitimate fear for the very survival of each species. In this situation any society with an ounce of self-preservation would have all available females of child-bearing age safely planetside making babies as fast as possible. Having a large family would, in fact, be seen as patriotic. It would be considered the height of idiocy to send a perfectly fertile female out to her death in a rickety one-person fighter.
And this would be orders of magnitude more important for the Vasudans, as they lost four billion people when Vasuda Prime was attacked.