By shooting the movie with a pair of IMAX cameras, each camera captures the information the way each of your own eyes would, then, when combined together, a 3D image is created in exactly the same way our own brains work.
In addition to it not requiring intensive post-production work, it also should simply look better because it’s more natural.
As Michael Bay points out in a Transformers: The Last Knight featurette, most movies have to have editors go through and transform a flat two-dimensional image into 3D by moving different parts of the image in each frame one at a time.