Jodorosky's Dune & a greater degree of collaboration...

"In December 1974, a French consortium led by Jean-Paul Gibon purchased the film rights to Frank Herbert’s epic 1965 science fiction novel Dune and asked Jodorowsky to direct a film version. Agreeing, he planned to cast the surrealist artist Salvador Dali as the Emperor Shaddam Corrino IV, who requested a fee of $100,000 per hour. He also planned to cast Orson Welles as the Baron Vladimir Harkonnen, who only agreed when Jodorowsky offered to get his favourite gourmet chef to prepare his meals for him throughout the filming.[22] The book's protagonist, Paul Atreides, was to be played by Jodorowsky's own son, Brontis Jodorowsky. The music would be composed by Pink Floyd, Magma, Henry Cow and Karlheinz Stockhausen.[citation needed] Jodorowsky set up a pre-production unit in Paris consisting of Chris Foss, a British artist who designed covers for science fiction publications, Jean Giraud (Moebius), a French illustrator who created and also wrote and drew for Metal Hurlant magazine, and H. R. Giger.[citation needed] Frank Herbert travelled to Europe in 1976 to find that $2 million of the $9.5 million budget had already been spent in pre-production, and that Jodorowsky's script would result in a 14-hour movie ("It was the size of a phonebook", Herbert later recalled).[citation needed]
Jodorowsky took creative liberties with the source material, but Herbert said that he and Jodorowsky had an amicable relationship. "

Whilst musing about a theoretical monster manual that grants the artists a greater creative stake in the proceedings, Jodorosky's Dune came to mind.

Now imagine an OSR RPG product produced like a movie, "jack does great monsters, Jill does great dungeon maps, Didier makes great NPCs", talented folks are comissioned by a "director/curator" to bring their individual strengths to bear on the individual elements of a project.

It could produce some "next level shit" or it could fall into the "design by committe" trap...