"SOME OF THE WORDS ARE INTENTIONALLY DOWNPLAYED IN FAVOR OF THE EMOTION OF THAT MOMENT."
Interstellar sound designer Richard King tells The Verge that you aren't always supposed to understand the dialogue because the movie is more concerned with conveying a broader emotional tone. "We mixed this in a way that people aren't used to," King says. "It's more about the experience. The visceral experience of the movie. Being with it. Allowing yourself to be carried along by it. Not grasping for every word, because some of the words are intentionally downplayed in favor of the emotion of that moment give by the actors' emotion and performances."
Totally. Reminds me a bit of the movie Alien where the inability to hear dialog during the dinner scene made you lean in a bit mentally. This of course tees you up for the big reveal. Nicely played Mr. King.