I bet it’s as simple as Nolan just wanting the biggest screen and biggest film negative he could practically get his hands on without inventing a whole new format. I do wonder if we’ll see him try to add anamorphic lenses to 15/70 IMAX at some point to try to make it widescreen again, which would be crazy (in a mad scientist way).

Also, I am kinda frustrated that he pushes for large formats so much and yet lights everything so plainly. I’d love to see him go for a more high-contrast lighting scheme like we saw in typical Hollywood movies in the 80s and 90s.