My dear, you forget of somthing very important.
It's not the raw power that wins the battles. Besides, while almost all the women care for their health and keep up their fit to remain beautiful as long as possible, many men just ignore their bodies, because sitting in front of computer screen keeps them skinny. We, with our unconditional love for candy, have to exersise and work out in order to keep our body shape attractive.
the more massive muscles you get, the slower you get. Fact, your attack power increase, but at the same time accuarcy and speed falls.
And, add the fact that no man on earth can ignore some of our disatracting techniques. It's hard to run or fight with an additional bone between legs, don't you agree? At least, I think so. I mean, it's pretty fragile and vulnerable, so when it gets bigger and easier to hit, it's not a positive in battle. And running with that thing bouncing up and down while swollen probably ain't comfortable either. We have no weak points as such. Our genitals not only can take a rightful dose of pounding, but also isn't any kind of interrupting anything. We are fit while still small, which allows us agile and swift movement. Our body shape, where our hips balance out the weight of chest and head is perfect for acrobatics and allows us even better movement.
Now, imagine all the women in the world, constantly having a PMS, add being pissed to that and optionally give them any random weapon.
Kind of frightening, nah?