Well, if you want some fetishes and not others then they should be optional. If you opt out of all but one then you should be able to enjoy that one. Just because you may have a majority of the fetishes available here doesn't mean everyone else has that many.
Never did understand why people get upset when someone else doesn't like the fetish they are are into. I think the only justification for getting upset about a fetish is if it is forced and the game and developer wasn't clear that it would happen. If they were clear it is on you. If they say it is avoidable and it isn't then being irritated is justified.
Well, I would argue that with the title it is pretty clear that the exploration of a lot of fetishes should be expected, and with the story being as it is, having them all optional, especially in a "all but one or two" meaning, wouldn't really work. After all, you score points for exploring fetishes, you need points to get to the parties ...
I prefer fetishes being optional, too, because I do not share a lot of them, but I knew from the beginning that I would need to swallow something I am not prepared for (extra lame pun absolutely intended, feel free to hate me). And I generally hate people who walk around and complain that their fetish is somehow making them and the games with it superior as well.
However I do not think that fetishes
need to be optional, because in the end the dev wants to tell a story, and if that requires a fetish to exist in game, then it needs to be there. There can be completely optional games of course, but they either base the fetishes as bonuses on a vanilla minded base game or are more or less completely sandboxy, neither of which is the case with this game. So if you want a "three fetishes only" game, even more so when you want to pick which fetish with whom (meant as a general observation, you didn't claim that), this game just isn't what you want.