Harry Potter and the Prisoner of Azkaban is widely considered to be one of the best outings of the entire franchise, and a lot of that is down to the vision that Alfonso Cuarón brought to the franchise. The auteur, who is also behind films like Y tu mamá también, Gravity, and Children of Men, brought a unique take on one of the darkest Potter books, and it really paid off.
Fans of the franchise have long wondered why he didn't return to direct any more of the movies. Now, producer David Heyman has elaborated on this, explaining the answer is pretty simple.