Indiewire – October 17, 2020 at 12:27PM:

A popular theory among the much-heated lore of 2015’s “Mad Max: Fury Road” is that director George Miller, along with co-writers Brendan McCarthy and Nick Lathouris, first approached the movie without a script.
In a series of recent tweets over the past week, McCarthy shut down the rumor by calling it “made-up bollocks,” and now director Miller has separately confirmed to IndieWire that there was most certainly a script.