I have now returned, from being swarmed by work.
Yes, a game with many fetishes, are way more easier to make successful compared to a single specific genre.
When you do pure genres, it gets very vanilla and repetitive.
As soon that there comes time when you have seen everything and things doesn't escalate, you often drop the game, as when you stop expecting new content or just didn't get turned on at all in a few updates.
Even the best CGs, doesn't always save a game, when story is lacking or that the scenes are repetitive.
It's sometimes like when a few games are limited in battle-strip/rape, but you suddenly gets turned off or bored by it, due to being repetitive.
So the best thing is to gather many genres and try to combine them into a good story.
Sure, some fanatics screams as soon that wrong genre is used, however they're a minority and are easily replaced.
If you do vanilla or in short a pure genre, you get a low crowd to your game and it can be incredible hard to stay on-point, especially if you're going to milk the game for a while. I never encourage only one genre, I seek many genres, due to that it brings more flavor to the game.
Of course I prefer femdom, but I'm also very found of BDSM, loli/cute, NTR and many other genres.
Of course, if it's going to be maledom, then I would prefer a proper character for it, like Kizaru and similar ones.
The prince on the white horse, doesn't always do well as a sadist or at least one tend to see how hard those characters are to make, especially if assets are made from specific engines which limit expressions.
A good idea is to add different replies from characters, which could decide what kind of scenes you get, possible like keepers, but not as forced on the choices. Replying those two games are tedious. See it as you could chose very different paths depending on your tastes, where it could require X points in a route to get certain content, I would try to play the majority or all of the paths.
Also those games who really force a genre too hard, can quickly fail.
Like including towering women, in very unattractive forms, often very bland, with similarities to male bodies even if they have breast, in pure femdom games. Or gigantic/massive breasts, which children might find cool, but personally too me, it turns me off, large breasts are fine, but there's limits, same with gigantic asses.
Or when they make a domination game and include a massive amount of gore in it, so that the domination part becomes none-existent.
If someone points out that the developers doesn't read these posts.
Then you should be assured that most do, at least under a hidden name, they experienced porn from somewhere and most likely, mainly through the illegal way, as you don't want strange genres on your credit card. Not to mention that every developer wants to know what people are saying about their game.