This shift was catalyzed by two major factors:

By the 1970s and 80s, documentaries began focusing on the grueling reality of production. Notable examples include Hearts of Darkness: A Filmmaker's Apocalypse (1991), which chronicled the chaotic production of Apocalypse Now , and Burden of Dreams (1982), which followed Werner Herzog's obsessive struggle to film in the Amazon.

:

: The grueling process of making a specific blockbuster or indie hit.