Only a handful of filmmakers have final cut rights in every contract they sign. What that means is that the financier or studio can make as many suggestions about what could be change or tweaked to the script, cast, or finished film, but the director has no obligation to listen to a single thing. In short, these directors have 100% control over what they're doing. As a concept, of course, this sounds like the ideal setup for making movies. After all, what do studio heads know about movies? They're businessmen, not artists, right? Quentin Tarantino began in the independent circuit and by the time his second movie (Pulp Fiction) was released to huge profits and acclaim, it was clear that this man was one of the rare artists who would forever get final say on everything he did from now on. In the beginning, he had final say over a series of low budget, low risk projects, but as the 2000s rolled around, the budgets grew increasingly higher and Tarantino became one of the even more extremely rare few who could make blockbusters and take no criticism from anyone giving him money.
Now, that is not to say there was no one giving him opinions throughout that time on how to improve his work, be it through pacing, what plots could be expanded on or taken out, or even music choices. From the very beginning with Reservoir Dogs, Quentin Tarantino got this valuable advice from a woman named Sally Menke, his editor. With Menke, Tarantino found a genius to shape his massive narratives into tightly woven, fatless products. That's not to say every project the two collaborated on was a masterpiece; I'd argue that their 90s work towers far above the post-2000 films with the exception of Inglourious Basterds. However, it was clear that Menke had the sensibilities that a studio head may not; she could take an objective look at what Tarantino made and turn it into the best product the story had the potential for. Tragically, Sally Menke died in 2010 at the early age of 56. A year later, Tarantino began work on Django Unchained, his most expensive project to date and ultimately his longest.