I don’t think that’s the case. White Album 2, Tari Tari, Vanishment, Honey and Clover, and so on~ Some people would even say NagiAsu or Kokoro Connect… I wouldn’t though >.> It’s just a lot easier to make a school idol anime and gain millions of fans.
I think you are going down the wrong route by using the term “mature.” Being able to work as a Live Action film doesn’t necessarily mean it is mature and realistic. I wouldn’t say F/Z or Psycho-Pass take inspiration from real humans. I loved Fate/Zero, it certainly worked on it’s characters, but I think there is a disconnect between the characters of the Fate franchise and humanity.
I never got far into Psycho-Pass, so I can’t say much about it~ If it improved later on then you might be right.
It seems like it is hard to balance it all. Focus on the world and the realism, or focus on the story? Almost all Ghibli films lack story, and the few that do have some story aren’t great.
As I said before, a greatly exaggerated example of what I mean by having a disconnect between the characters and humanity, is to watch something like DRAMAtical. You could even go watch Canvas: Motif of Sepia if you want to suffer.
They have massive flaws all over, not just the antisocial nature, but elements of the awkwardness can definitely be seen in a lot of other anime.