I think because once you break the seal on generation ships, that becomes the story. There’s so much required for humans to actually commit to that plan. It would shape everything, and you’d need to explain how they overcome certain problems.

You’d need to show what was worth the commitment to begin with - what’s the goal / where are they going and why? And you’d need to show how they selected crew for their fertility and genetic composition overall, probably not with a 1:1 female:male ratio. And you’d need to explain how they got people to commit to their children dying in space. And, once that generation was raised, how they kept it from revolting and turning the ship around to Earth so they could see the sky before they die. Would they raise them on lies? And how many generations of humans do they need to go through to reach the destination? How are they going to solve all the gravity, radiation, and thermodynamics problems? Whats going to fuel a ship for hundreds of years? And of course your book starts to have the Foundation problem of having multiple whole sets of characters in one book. I think that’s just challenging for any story, or at least you can see why I say it takes over and shapes the entire story.

There’s just so much to it that it takes over the narrative. So in your comment where you say you’d like to see more of it… do you mean more stories about this? Or you just sort of expect it to be in the background of more stories?

I guess it was kind of in the background for The Expanse, with the Navoo Mormon generational ship. Which in one fell religious stroke answers many of the questions in a believable way, including the male/female ratio and how anyone would be crazy enough to do it.