Justice League’s behind the scenes drama escalated beyond anyone's expectations in the months following its release. Joss Whedon stepped in after Zack Snyder’s departure. This worried fans that the movie would suffer. But the cast and crew swore Justice League was still Zack Snyder’s movie and would adhere to his vision.
When the movie arrived that wasn’t the case. A significant portion of it is clearly the result of Joss Whedon led reshoots.