“I’m drawn to working at a large scale because I know how fragile the opportunity to marshal those resources is,” Nolan told the publication about sticking with big productions. “I know that there are so many filmmakers out there in the world who would give their eye teeth to have the resources I put together, and I feel I have the responsibility to use them in the most productive and interesting way.”
Source: Christopher Nolan Won’t Direct Small Movies, but Loves ‘Past Lives’