It's a nice change of pace from the typical flowery uwu butterflies and sunshine stuff that's prevalent in the world.
Getting Us isn't mandatory. If it icks you, just skip it.
Developers shouldn't be expected to tweak their vision for something based on how the minority of players perceive it.
Us, and that scene in general, is overwhelmingly popular.
Maybe M-rated games aren't for you? May I suggest trying some JRPGs? Plenty of pretty colors and the "power of friendship" tropes without a dark theme in sight.