Bryan Fuller was fired during preproduction, and they drastically changed the story he had in mind and just ran with it.
On the other hand, Bryan Fuller was responsible for the thing people hated most of all about the first season of Discovery:
The other Bryan Fuller contribution that remains is his redesign of the Klingons. “One of the things he really, really wanted to do was shake up the design of the Klingons,” Herberts said. “One of the first things that he ever pitched to us when we were deciding whether or not to come on the show was his aesthetic for the Klingons and how important it was that they be aesthete, that they not be the thugs of the universe, that they be sexy and vital and different from what had come before.”