I read a lot of "book in which you are the hero" (called "choose your own adventure" I think in the US) in my early years. I'm always surprised the niche for t

I read a lot of "book in which you are the hero" (called "choose your own adventure" I think in the US) in my early years. I'm always surprised the niche for this type of work in so small and revolves around the same themes and for a young audience. I think the fear of missing out on the alternate stories might be a factor but nothing would prevent you from reading all branches. Where are the "choose your own romance", the multiverse science fiction, the time travel stories where you pick the changes the hero does to the past, etc.