The movie is designed for IMAX, and the movie’s deliberate 4:3 aspect ratio exists for story purposes.
Zack Snyder fought so hard to ensure that his version of Justice League — the mythical Snyder Cut of the movie — would see the light of day, and benefitted from the incredible support of his passionate DC fanbase.
And you know that he’s not going to stop at getting the Cut on HBO Max (as much as that is a win).
And an event that I’d absolutely move mountains to attend.