How Did Christopher Nolan Keep Creative Control?

David Senra, reading the book's account, says Christopher Nolan kept creative control by working a little faster and a little cheaper than people expected, so nobody had a reason to interfere.

The efficiency of filmmaking was his way of keeping control. Pressure from time and money felt like a restriction, yet it forced decisions. A known deadline made his creative process speed up exponentially. He guarded creative power by spending less and moving faster. He made the choice very early: work a little bit faster than expected and a little bit cheaper than expected, and the studio would let him do the work his way. A big movie pushes a director to hire an enormous number of people, then feed that beast. Ask for a robot on a science fiction film, step away, and return to whatever the team built on its own. Nolan wanted to stay involved. Big studios spend millions of dollars on films that never happen. Nolan worked out of his garage, finishing as much pre-production as he could before spending any money.

Constraints bred resourcefulness, and resourcefulness is what let him hold control instead of feeding a studio machine built for waste.