True, but there needs to be a good reason for it, even if it's a bit of hand-waveium. Saying she is quick, smarter, etc. is a good reason. It might not be realistic but it'll work well enough. But if you say that an Arya character beat a Clegane character without a mentioned justification not a single person would believe. They, like I, would toss the book and call BS. To your fictional men point there is always a reason why they're defying basic facts of life. When applied logically it may not actually work, but it's still a reason and readers will say, "I can accept that." The same must apply to women as well.