As someone that wanted to get into anime and Japanese media in their 30s, this characteristic has majorly turned me off from the most anime, manga-derived games and JRPGs. I just cannot stand their lack of subtlety and nuance in writing.
It is a major and understated expression of the Western-Eastern cultural divide. In the Western world adults tend to appreciate sophisticated stories, maybe too much so, while, from what I understand, the traumatic break from happy school life to overly-rigid business Japanese culture is the reason why even grown adults tend to find refuge in late teen/school-age drama. Most Japanese animated media is made of, but not strictly for, 17 year olds in their senior year of high school fighting the universe and God himself.