Scrapped World War Z 2 plans reveal that the canceled sequel could've remedied major complaints that emerged from the first movie. Marc Forster's 2013 film caught slack for being unfaithful to its source novel, Max Brooks's World War Z: An Oral History of the Zombie War. The book reads as a post-apocalyptic collection of individual accounts told to and recorded by a United Nations Postwar Committee agent following a zombie plague. The movie version introduced a single protagonist, Brad Pitt's Gerry Lane, as a former United Nations investigator seeking a solution for the sudden zombie apocalypse, but other than that sentiment, World War Z deviated immensely from the novel.
https://screenrant.com/world-war-z-sequel-last-of-us-zombies-plan/