Ever since Dark Knight Rises ...

I watch very old movies on TCM all the time. More than eighty years ago, they had the capability to record sound so that every word of dialog could be understood easily. Apparently that technology has been lost.

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Dunkirk has very minimal dialogue and what is there is not that imoortant in terms of missing a word or two...

The first 20 - 30 minutes doesn't have much dialogue apart from a few screams and grunts...

So any supposedly muddled dialogue is not an issue here.... even though i could hear every single word of this movie in theatre and at home...

As a matter of fact, it was deliberate. Originally, Nolan even wanted to shoot Dunkirk script-free. (The film hasn’t been likened to silent films for nothing.) The director has stated loud and clear that his intention was to make the sound, score, and picture of Dunkirk a priority. He acknowledged that the dialogue isn't supposed to tell the story. So yeah.

Although I have no issue understanding the minimal dialogue that is actually spoken in the film, what is said is not important. And yes, the same can be said for Interstellar. The way the “creative and adventurous” sound ended up on that film is exactly how Nolan intended it to be. But in his words, he will be going back to dialogue again.

By the way, when you have someone like Tom Hardy (who some viewers have a hard enough time understanding in many movies) doing a wild voice like Bane’s, Nolan can’t take the blame for the mask villain’s intelligible speech. :D