Listen, your OP examples are bad. Yes, it's undeniable that the Academy thumbs their noses up at blockbuster pictures and often cater to Oscar bait. I personally think most biopic movies should just be ostracized by the Academy as they follow the same formula and are shot the same way, the thing they criticize blockbuster movies for. Yet, they are nominated because A) no one would ever see them otherwise and B) it allows actors to jerk themselves off.
The King's Speech is not an Oscar worthy picture nor is The Darkest Hour. But, movies like Moonlight, Get Out, the Florida Project, Pulp Fiction, etc. are obviously deserving. The Academy will turn down TDK or Inception but then nominate Dunkirk. Like, come on.
They don't need to dilute the quality required for Best Picture, but they do need to stop ignoring popular movies unless James Cameron forces them to.