I agree with most of your points, but why are you acting as if "story with substance" is some kind of rarity in AVNs? When we have games like Eternum, Companion of Darkness, Inanna Revenge, Being a DIK, Harem Hotel, Ripples, Lucky Paradox, Stray Incubus, My Bully is My Lover, Fates Collide, Leap of Faith, Wild Cats, Cosy Cafe, The Nature of Magic, Cross Realms, and so so many more. This one isn't unique in that regard, it's one of many.