> It's because film is a visual medium,

It happened with books too: See "Liar’s Poker", by Michael Lewis. He says that he wrote it "so that fewer idealistic college kids would dream of working on Wall Street. ... Somehow that message failed to come across ... They'd read my book as a how-to manual."

http://www.gatsby.ucl.ac.uk/~pel/misc/The-End-of-Wall-Street... https://danwang.co/liars-poker-by-michael-lewis/

Michael Lewis also wrote "Moneyball" and "The Big Short" which were made into films.