Movie directors aren’t interested in making their film comfortably fit your home screen, they’re interested in choosing an aspect ratio that best fits the film they’re making. Since movie theaters traditionally project a film onto a screen in a darkened room, they can adapt to any aspect ratio. Your 16:9 display is the ratio best able to display the majority of common ratios, as another responder described. If the director didn’t choose 16:9 (as is the case in pretty much everything made for either film or television until the beginning of the twenty-first century), then the rest of your display will of course be blank.
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