Following the resounding success of Patty Jenkins' Wonder Woman, it was only natural for Warner Bros. to reevaluate its previous movies to determine what went wrong and what still needs to be fixed. The studio’s first move was to replace Zack Snyder's vision for the shared universe with Geoff Johns’. Then came Jon Berg, who is now serving as part of DCEU's brain-trust, alongside chief creative officer Geoff Johns.

Basically, Berg and Johns are plotting the major DC Extended Universe story arcs and guiding the solo movies’ writers and directors.

Berg and Johns looked back to see what went wrong with Batman v Superman: Dawn of Justice and Suicide Squad.

Jon Berg has a point about the movies:

You would be silly not to analyze how a movie was received, what went right and what went wrong on the making of a movie. On Suicide Squad, the movie did incredibly well commercially. It didn't work narratively. You had some great casting and some great characterizations, but where the story fell down was on narrative, on plot. We could do better. Batman v Superman was tonally dark. People didn't respond to that (Variety).

On the other hand, we could add that the problem with Batman v Superman: Dawn of Justice wasn't necessarily its tone, but the story itself. Logan was as dark as it could get, but critics praised it.

We can say that Batman v Superman: Dawn of Justice crammed too many stories into a single film and that it had virtually no chance from the start.

Geoff Johns seemed to agree with Snyder's vision, despite the perceived dark tone of his movies:

Wonder Woman celebrated exactly who the character is, but looking at it, it's not like we should change everything to be about hope and optimism. There's nothing to change. That's what these characters are.

Basically, Johns said that these are the characters as they were described in the comics and that the DC Extended Universe will continue to present them in that way.