9. A Few Neat Touches From The Original Cut Are Gone
Before the Snyder Cut was released, Snyder made it clear that everything shot by Joss Whedon for the theatrical version's reshoots (after Snyder departed the film due to the tragic death of his daughter, who the director's cut is dedicated to) would be completely removed. Honestly, that wasn't the best idea.
Joss Whedon's Justice League is a perfectly solid film, and there were quite a few good things in it that this cut would've benefitted from.
More specifically, Whedon's version had far, far better comedy than this version does - such as Aquaman (Jason Momoa) sitting on Wonder Woman's Lasso of Truth - and it also had more conflict between the members of the Justice League.
That terrific scene where Batman (Ben Affleck) and Wonder Woman (Gal Gadot) argue in the Batcave is completely gone, as is most of the conflict over bringing Superman back.
In the theatrical version the Justice League debate about resurrecting Superman, but here they do it (mostly) without a second thought, and that doesn't work as well.