In fiction, what's important is internal consistency.
Now, in most Wuxia, the author stated pretty clearly in terms of raw force women generally tends to be weaker than man (or at least, when it comes to brute strength, it is always a guy).
But when it comes to internal energy cultivation, which is the real engine behind MA power in Wuxia novels, being male or female make no difference. Sure, females are probably more Yin energy, but both male and female can reach very high level of internal energy, so that point is moot.
In another word, in Wuxia, women potenital in MA is just as high as the men, but since most reader/author are male and since vast majority of praticuionar of MA are probably male in a story context, hence there are more male elites than female elites.