Whats with the trend of overpowered characters?

Does anyone else find it odd that a lot of anime and manga has overpowered characters? I don't see how that can be interesting personally as I like the underdog experience better. I did like Grimgar Ashes and Illusions because it featured characters who genuinely where struggling against goblins but in another anime those goblins are insta killed. Why did the overpowered trend become so popular?