Yet it's what most of games here are about.
Stand out of what?
MC's don't stand out if they are yet another brainless chad, or yet another 20yo virgin who dream to be a stud. Same for the girls... Most MC in incest games have the mandatory three sisters as defined by
Perverteer in
Sisterly Lust. And when there's not three of them, you can still be sure that there will be the bitchy sister, constantly angry at her brother because she secretly dreams since years to be his sex slave. And it also apply to none incest games, if a girl is extra smart, then there's 95% chances that she'll also be a virgin; bonus point if she's also a sub.
After one hour playing most games you can already predict what will happen between the MC and the LI. Perhaps that it's good for those who play to fap. But half the players want something interesting, something they'll want to play again to know what will happen.
It's by having a nuanced personality, and by surprising the player, while actually being accurate to their personality, that a character stand out.
Must also be pointed the fact that a big part of the players are over 30yo. They aren't this interested by the life of a horny teenager who jump in all panties he cross. Incel dreams like WVM aren't what they are searching.
The ultra stereotypical Japanese date sim tropes don't works as much as you think, at least outside of Japan. Mostly because it's stereotypes that don't really apply outside of the Japanese culture.
There's an appeal at first for none Japanese players, but it's precisely because it's something new for them. Therefore, precisely because it goes at the opposite of what you said above.