Well that's different because say what you will about Snyder, the entire film was always set up and planned on a Batman-Superman team-up and conflict.
It becoming a Justice League Origin story, and introducing Wonder Woman (which was announced in the lead-up to the film anyway) felt more CYA but even then the marketing basically revealed all the stuff in the film (i.e. Wonder Woman, Doomsday, even New Gods stuff i.e. the Omega logo in the sands). And it was all featured prominently just not executed very well.