Which type of film would typically require the least amount of input from a screenwriter?

A documentary film typically requires the least amount of input from a screenwriter, as it often relies on real-life events, interviews, and existing footage rather than a scripted narrative. While some documentaries may have a narrative structure, much of the content is derived from actual occurrences and interviews, reducing the need for extensive screenwriting. Additionally, reality-based films or unscripted formats also demand minimal screenwriting input.