why not... BOTH! It's alright to appeal to more audiances and the male overpowering the female makes complete sense. so it could work like you have two routes you can choose so that you can win and become the dominator, or get dominated.
Even though I see what you mean -- the world, on which games are often patterned, is a place where everything can happen, which is why it appeals to all kinds of people... yeah...
Still... You see -- there is also a group of people who would be displeased by a world like that. Part of the charm of certain worlds is that certain features -- say, magic -- are unavoidable even if you don't believe in them. It's part of their charm. Likewise, for femdom players, part of the charm of a femdom world is its unavoidability. It lends further strength to the fantasy of the female as the powerful one, to which the male has to submit. No matter how cunning he is, or how much he struggles, he is eventually utterly defeated -- that is the charm of the whole thing!
So here's a compromise: there could be both kinds of things. A game which can be whatever you want, from a light fantasy about saving damsels in distress from dragons and being rewarded, to a dystopian dog-eats-dog wasteland. But ALSO games that either ONE thing OR the other BUT NOT both. I don't want to get Boolean about it, but there is a reason why we need all those operators to code well... So if you want a sci-fi game, don't go to a fantasy one. Or if you want a game that can be BOTH sci-fi AND fantasy, then go to one advertised as such. But if the game says "femdom" and nothing else... don't go to it unless this is your thing.
The idea of appealing to as many people as possible has a good ring to it, but like all fantasies of full inclusiveness, it ends up becoming dull, because it cannot allow itself to really commit to anything, since whatever it commits to there are people who would prefer something else. There is also value in the idea of a game that makes a choice -- say, femdom -- and then commits to it with all its power and imagination. Even when it goes against my own tastes, I can appreciate that. (I'm quite a fan of Maggot Baits: even though its extreme maledom / gore features make it completely non-sexual to me, I can see how the developers committed wholeheartedly to its premise, to the point of adding great writing to what is basically a gore nukige -- and I can, and do, admire that.)