The Flash failed, among all the other reasons, because it wasn't a movie that appealed to all four quadrants. It failed at that," Muschietti said in an interview with Radio Tu where he also spoke about his upcoming Batman movie and Shadow of the Colossus adaptation (thanks, Variety). The director went on to explain that he found "in private conversations that a lot of people just don't care about the Flash as a character. Particularly the two female quadrants. All of that is just the wind going against the film I've learned.
It’s pretty clear from looking at the original DCU that it was all a panic response to everything Marvel was doing with its cinematic universe. Like, who wanted a Black Adam film? You don't just make things for the sake of having a connected world, and you especially don't listen to The Rock when it comes to making business decisions (we all remember that Henry Caville Superman cameo).
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