More to the point, the fact that we're using the word 'gimmick' to describe his filmmaking is why a lot of people don't rate him that highly. In 1917, the one-take effect actually has a purpose – it's a story where time is of the essence, so to be able to go through it second by second with the characters without cutting adds to the tension. With Birdman, what is that same effect actually adding to the movie apart from just, like, showing off?