Meh. Supposedly his Justice League would've also featured Diana failing to save the hostages in her first scene, still getting her ass handed to her by Superman, and (allegedly) murdered by Darkseid in the second JL movie. But I guess in Snyder's world, decapitation makes up for that.
Theatrical cut, Snyder cut...show me the cut of the movie that doesn't turn Wonder Woman and the rest of the League into chumps. Otherwise, screw the both of them.
It's not like he would have been singling her out and everyone else would have failed against Darkseid. Killing Steppenwolf would have been a better use of her than what we got.