What is the significance of Zack Snyder's Justice League?

Zack Snyder's Justice League is a four-hour director's cut of the 2017 Justice League film, released after Snyder stepped down due to personal tragedy. It's considered a significant improvement over the theatrical version, restoring Snyder's original vision for the film, including more character development, a darker tone, and a more cohesive narrative. It's often seen as a definitive version of the story and a testament to Snyder's creative intent.