Basically, I do not see animes. It may be possible to be strange for you, why I am here. I like rather books, manga than anime or game. I haven't seen so many anime. But several anime are impressive for me.
At present, I can remember one anime. (old one for you though).
灰羽連盟 Haibane Renmei (Charcoal Feathers Federation, CFF).
The ending of this anime is in a sense "stereotype". Many stories have this kind of stereotype.
"Haibane Renmei" contains really very important theme in the settings of the world. It introduces metaphysical problem. Or at least, Existential problems. Jaspers oder Heidegger, or Sartre. Time and Existenz..
However, Anime did not extend its fundamental theme (It may be just my mirage, possibly).
But the last episode sometimes made me with tears (13 episodes in total). We are existence of solitude. Human soul is always alone. And Life is really uncompleted anytime. Though the anime has ending, but our life does not have ending. The death of us brings us some kind of quasi-completion of Life.
_ mrd