You can see it in other media, too. Same tired tropes most of the time.
You can even see it in social media, you can make out the common tropes shaped by the society/culture/subculture/mainstream media and while original thoughts and non-us/them|black/white comments are there, they get downvoted. Which is pretty sad. All the while, everyone thinks they're right and better than everyone else.
Japan's entertainment is not that different imo, most of it uses the same tropes, maybe with a small difference (that they later forget about). But yeah, some actually original content shows up more often.