>war themed
What does this even mean? large-scale conflict? Because it's more interesting to follow the conflict and development of individuals. If you mean war as in, realistic, modern, conflict, then that's due to the fact that anime is useless if it doesn't display something that can't be achieved in real life. People want retarded hairdos, colorful shit, neat impossible action scenes. Also because most anime end after 11 episodes, and really who cares what side wins some larger than life battle?
>>526
>more darker
Because you can't air that on television. It's why One Piece is censored, it's why KHR can't have a 5 year old implied drunk even if it's necessary to showcase a parent figure being a bad influence or a character whose entire concept doesn't work if you take away his characteristic of smoking. Anime will never be more dark because it's too expensive and unprofitable to make anything more than genre-fiction. You can't even properly put into words what it is you actually want from anime, how do you even know what it is?
>nearly everything feels the same
That's because it is. You're not supposed to watch nearly everything.
>why aren't there any historical
Because if you want history, you read a book. Educational anime is boring because it was made to be boring. Or it's a dramatized, propagandized piece of garbage. Anime would be hilariously inefficient in teaching and you'd end up reading subtitles on a screen to begin with, so you might as-well skip the pretense and pick a book. It's also because anyone that needs to be made aware of history through an anime would be a preschooler so the themes you'd be able to handle wouldn't be dark enough to satisfy your fancy.