Because Devs in general want to make "Replayable" games, because they work so hard into something that they think we will love to experience it again and again. And won't mind the grind.
I love the art, I love the characters, the story, the kinks... I love the core game, but having to check 3 pages of wiki every time something happens turn me down too much to keep playing.
I stopped playing this game like a year or so ago because everything you do can somehow block you out of a lot of content. I hope that someone will make a mod eliminating disapearing girls at least, like, I don't know, make them revert in the story or something less punishing.
This game is designed as a dating sim roguelike somehow hahaha