The REAL Best Pictures by BringMoreLegos

Question 5

Those nominators concerned with the perennial lack of female nominees for Best Director could have turned to this best movie of 2017 (despite the dubious history of its own gigafranchise)... and yet. It's not like movies about a princess named Diana haven't done well at the Oscars (just ask that 2007 Best Actress winner from Q3). What film is this?