So your contention is because you don't like it, or understand it, nobody should have it? That seems a little conceited. I have to blow off a lot of games just because they have what I consider to be awful fetishes like dickgirls, but the joy of this game is it lets you control most aspects of fetishes that get implemented. I don't typically go into a game with a fetish I don't like and say in the discussions "you need to not do this/you need to remove this feature because I don't like it". The reason I would like to see a pregnancy/offspring system is for it to be more of a punishment or reminder of past situations, or to have children with one of the love interests and figuring out how to deal with that.
Keep in mind this is still a game, the ability to glaze over some aspects of realism to make it work is something that can easily be done.
My guess is, at first maybe you have to hand the children over to the state (maybe there's a sort of fine for it), because right now I find it easy to make so much money in this game that it's impossible to spend it anyways, then you can unlock something later to tend to offspring, like some sort of rented property with a nanny, if wanted. Gestation can be massively shortened, how about just to a week or two? Again, it doesn't have to be totally realistic, just close enough to still make it work. Maybe actually being pregnant can attract additional unwanted attention and have unique dialogues or events revolving around it. All this stuff can be added over time, it doesn't need to be all at once, it's just a game, it's fine. If it's not your thing that's ok. There's a decent amount of fetishes in the game I don't like, but I tend to avoid them or toggle them of if possible, regardless of the overall gameplay effect doing so has.