This might be a wild theory, but here it goes - Zack Snyder became so angry at the fan and critical response to his film and decided to punish us by not releasing the film on its premium format, that is in shifting aspect ratio of cinemascope and IMAX.

Also, in one interview, Snyder and WB did say (I do not remember the original article) that they were changing the tone of the future films not because they accept their faults in making the final edit of BVS, but because fans wanted a certain kind of film. Which basically means that he thinks we lack intelligence or are unable to appreciate finer aesthetics in films because his was poorly received. That’s an insult to us.

By the way, the extended cut for BvS was a completely different movie. Miles and miles better than the thetrical cut in my opinion. I’d go so far as to put it closer to ‘The Dark Knight,’ especially due to the way the plot is intelligently interwoven. The ext cut is more cohesive and makes the intentions and actions of the characters absolutely clear. Like TDK, it also now plays like a thriller. The theatrical cut in comparison feels like a pointless exercise.