Calling someone childish is basically the most childish thing one can do online, you know...
I'm try to be neutral here since it's more of a taste thing, but it's apparent that your standard of what is "good" is vastly different from the mainstream. Well simply look up the ratings of the games you mentioned on F95 and see for yourself.
Ratings are one of the least useful metrics of game popularity anywhere, be it here/Steam/Metacritic/wherever. The vast majority of people don't rate games in the first place, which skews ratings to the hardcore, and thus makes them non representative of the mainstream. This is skewed even further in recent years due to stupid stuff like brigades of people vote bombing/pushing up review scores. And the fact that more specialty sites such as this one tend to rate things as either 5 stars or 1 star, with little in the way of nuanced middle opinions.
If you want to look at mainstream you would need to look at what the highest selling/most funded games are, since those are far more accurate statistics to measure to what most people like then ratings are. And, even in the Japanese market, VNs, or games with RPG-lite mechanics like Evenicle, are the overwhelming majority of porn games. Things akin to Fallen Doll, such as Honey Select, aren't a particularly common kind of game. And while HS is by no means an unpopular/niche game, it by no means represents the general market even there.
The same is true of western porn games. Out of the top 100 adult video game creators on Patreon, theres all of like two in this category. Those being Fallen Doll, and Wild Life. And Dark Cookie is currently sitting at number 1, with nearly 3 times as many patrons as Wild Life has, and 1.7 times as many patrons as Fallen Doll does. Subverse itself was one of the most funded games out there, and was the global top seller on Steam, and it marketed itself as nothing like games like HS/FD/WL.
The overwhelming majority of people throwing money at western porn devs aren't doing it for games like HS/FD/WL, they are doing it for more VN style games, or RPG-lite kinds of games. Games like FD, and WL, represent a far more niche market, and are the definition of not mainstream because of it.
