They, somewhat disappointingly, kind of not talk at all about why they chose a female hero; more like "it could have been either"; which is perfectly fine of course.
For the record the main character increased my interest in the game considerably. If it was generic white dude #28793 and it didn't have the mechanical beasts I probably would have as much interest in it as Dawns seem to be on the Horizon.
They are probably asked at every single interview the same damn stupid question. I wouldn't be surprised if they are just tired of it already especially when they would never be asked,"Why did you choose a male character as the protagonist". Its an annoying stupid basic question. Its like famous actresses going to the Oscars for a gripping, deep, powerful role and the main questions they get asked are who made their dress and who did their hair and makeup and that kind of BS questions that don't really pertain to their role. I bet they feel much the same.