[Warning: Wall of text, because I am stupid and don't know how to be concise]
Sorry about the wall of complaining....
I don't think there's need to apologize, different people have different sticking points is all. (also, that's not a wall. This is.) I do think that you touched on why it's different here, though:
Random Zil, Sydian, and Milodan get pregnant/get them pregnant and they just leave
You have random unnameds that vanish, compared to a lingering named NPC. The more there is to connect you to something, the more likely it is that you will, in fact, connect. Nine month pregnancies in game are less likely to be waited through since you can run through the game's current story in less than 10 days, including travel time. The more convenient you make something, the more likely people are to interface with / enjoy / connect to it. This also applies to egg babies. Humans aren't hardwired to connect to a belly full of eggs like they are to connect to infants. Once that egg turns into a baby, there's a much stronger connection point, especially when you couple it with the idea of a parent being unable to look after their offspring, something that other pregnancies in game don't take the time or care to highlight in the same way. TL;DR, this situation seems to give more things that people can connect to, so I would expect to see more people connect to it.
Almost everything I read about the pregnancies is people treating it like a numbers game, not caring about the other parent in most cases, or even treating it like a fetish.
I think it's important to remember that those are often different people, although there is overlap. People absolutely view pregnancy as a fetish, but I don't think that a parental type response is connected to that. As much as there is overlap between the people who see pregnancy as a fetish and the people who feel a protective instinct when faced with the idea, these are still two separate groups. I think an interesting way to see the different groups here is to look at the way people approach characters like Briha here, compared to how they approach the idea of pregnancy in general in the "Who do you want to breed" topic.
The numbers game thing is a bit different though. I think that's more of a gamer thing. Wanting big numbers for the sake of having big numbers. I have characters with absurd cum quantities but have no real cumflation fetish. I just want big numbers. There's probably overlap between people actually having the fetishes/ feeling protective and people who just want to see big numbers as well, but I think it's still primarily a matter of distinct groups.
Besides, Steele and most of the people they can have children with are really young compared to their life expectancy, it's a terrible idea to have kids that early, and even worse to simply not raise them; they're likely to end up in some ungodly factory-like mass homeschooling program.
I absolutely agree with every word of this, and it's why I do everything in my power to forget just how young PC Steele is, because holy crap you JUST became an adult, you're basically a baby yourself. Thing is, as I said above, everyone has different sticking points, and while thinking about Steele's age makes me uncomfortable, a lot of people are ok with it. People don't exactly think about the disastrous effects of having kids early in real life, so I don't exactly expect them to do so in a porn game that lets them side step those issues to some extent.