I love “Fitzcarraldo” (by Werner Herzog, with Klaus Kinsky), a story about mad vision in the Amazon forest. And yet, the making-of film “Burden Of Dreams” (by Les Blanc) completes the movie organically, not only as a Blue-Ray added value. The same I can say about “Apocalypse Now” and its making-of film “Heart Of Darkness”.
Independent films can tell their making-of story as an organic making-of doc as well. The story of a movie starts with idea, and journeys thru development, Kickstarter / Indiegogo campaigns, etcetera.
The image that comes to mind is the Trojan Gift Horse, full of power within, and only in appearance a predictable offering.
Once inside the gates, the movie-horse can open and reveal hidden content.