Anya Taylor-Joy in Furiosa: A Mad Max Saga Warner Bros. / Warner Bros. It’s pretty silly to get hung up on how much money a movie makes. To obsess over box office is to think like a studio executive — or maybe worse, like the “analysts” who fill trade columns with their salivating desire to see, say, Kevin Costner lose his shirt on an ambitious, big-swing passion project like Horizon: An American Saga. “Movies live forever,” the actor-director told IndieWire this past summer. “It’s not about the opening weekend.” Amen…