At one point in its history, Oscar voters routinely named blockbusters such as “Titanic” or “Gladiator” as the year’s best. That’s changed. Recent best picture victors such as “Moonlight,” “Spotlight,” and the 2018 winner “The Shape of Water” have been firmly ensconced in the arthouse world, whereas well-reviewed hit films such as “Guardians of the Galaxy” or “Star Wars: The Force Awakens” have only been recognized for their technical achievements.