Knight of Sidonia time travel challenge

Okay so to put it simply I have developed an in The knights of sidonia. I've read a bit of the manga and watched it the anime and read fanfiction. So I have a question. Why doesn't anybody write a fanfic about Nagate Tanikaze going back in time and have him Not repeat the mistakes in the past and lead a more successful garde pilot career with less deaths? i'm just saying please.