Well I would guess itÂ’s from whatever Snyder had planned? Movie synergy was a big factor. Superman was either dead or evil(possesed) and killed everybody. We saw in both versions of JL how Diana and the Lasso of Truth was nerfed so she couldnÂ’t snap him out of his rabid dog like state as she usually would in the comics for contrived plot reasons.
Then we had the initial pettiness from the beginning of the Rebirth creative teams.
Idk.. I donÂ’t have much to say or even care to figure it out anymore because there just hasnÂ’t been a valid reason given that DCEU has been an embarrassing disaster, comics and animation seem to be average middle road and DC as a whole brand is deemed as damaged now.