Moving on from sandboxes, thanks for playing ball,
It's perfectly plausible for someone to write a riveting college story. Mass appeal just means writing while making sure your story is appealing to the largest possible audience, and that contains its own set of challenges. Badik is typically seen as a "by the numbers" erotic game, and frankly it has better writing than most games on this website. You don't need an original story or a complicated one to make a compelling story.
And to address your second point, I'm sure you do bend your story for others to some extent, whether you realize it or not. Your "vision" is affected by how others perceive it at every step, and that's normal, especially given that it's a source of income here. A bit unrelated, but since you brought it up, book authors typically have an editor and a publisher on their ass to control their "vision".
I think everyone can see your point of view and respect your opinion. It's just that this is a thread about story-first games, and the people that participate here generally value the dev's creative license highly, whether it fits their own particular fetish or interests.
The sentiment that devs should appeal to the masses to bring in the bucks is counter to giving devs the environment to exercise their vision.
I'm not sure how long you've been around this site, but the "masses," or at least the masses that like to comment on the game threads, are some of the most childish and entitled bunch you can find on the internet. Catering to these folks is how you get yet another generic safe space harem. It's fine to make a safe space harem, and some of them even manage to be somewhat interesting, but doing it to satisfy the masses instead of doing it because the devs personally like that type of story is what we don't appreciate.
If a dev wants to include a sister or mother in the story, the masses will demand they be fuckable. If a dev wants to depict a grounded story with relationships that don't involve the MC, the masses will cry about NTR, even if the intent was nothing close to actual NTR (corruption, jealousy, betrayal, cheating). If the dev wants to depict an underdog story where the MC starts out really weak or inadequate, the masses will cry about the shitty MC. If the dev wants to depict a morally fucked up MC, the masses will complain about the asshole MC. The list goes on.
The "masses" are trying their goddamn hardest to steer the devs into making the game
they want. I don't know if that is a healthy environment for developers in your view, but I personally think the masses can go fuck themselves.