Closest I’ve seen to this being done was the movie Black Hawk Down. Meanwhile can you imagine everyone screaming at each other in the John Wick films? Other movies like Aliens would have been a whole different level of horrifying as the sound fades away until its just the sound of the actor’s muffled heart beat and their cluelessness that the xenomorph is crawling up behind them.
Save the realism for the documentaries, I want escapist fun.
My original thought in the actual shower was tilted more toward the absurd. All the elequent monologues and comments being washed out with “what?!” and “did you say something?!”