RE: So, #nintendo is releasing #NintendoSwitch OLED Model which has a lot ...

I don't think they'll do that. Even if they wanted to, it'll be too late to add them 4 years into the system's life, and it'll be insanely hard to add them to earlier games.

But some games I played (Disgaea?) had in-game achievements as part of the game, if you're into that.