Fast X's original director, Justin Lin, reflects on his surprise departure from the movie. Lin, who had directed five installments of the Fast & Furious franchise, including 2021's F9: The Fast Saga, was an obvious choice to helm the 10th movie, which officially started production in the spring of 2022. Only a week or so into filming, however, it was announced Lin had quit, with Louis Leterrier eventually brought on to replace him.
https://screenrant.com/fast-x-movie-justin-lin-exit-response/