I sound like an old man, but it’s pretty much impossible to understand what people are saying. The current trend of mumbled dialogue is probably great for atmosphere - but I can’t hear what they are saying.
(However, last time I have seen a movie, it did have subtitles, but there was also an entire orchestra in front of the picture and the subtitles were difficult to see because the musician's head blocked the view. If I was sitting higher up then I could probably see it better.)
(Which with current state of technology would not work: the automated decryption of mumbling is not yet superhuman.)
I recognize TVs aren't 1:1 on volume scales. When I am at my house, I can listen to the television at 5 - 15. If I have anyone else over it has to go to at least 40. When I go to someone else's house (both older and younger than myself) but am watching the television by myself I'll turn it down to 10 or so, depending on how far away I am. Everyone else gets concerned like I can't hear it. When I am watching the same content on the same screen with the same speakers, they regularly need it back toward 40 at a minimum.
I have to imagine that while audio mixing may not be as clear as it was before it does not rise to the need to increase the volume as much as folks tend to nor the need to use subtitles.
Personally, and maybe this is from watching anime a lot, as soon as there are subtitles, I read the subtitles and the actual content on the video is lost because now there are words on the screen that my brain needs to read rather than consume the actual content. It turns content into poorly written novels.
I also really don't want to miss dialogue every time I'm eating a potato chip or a car drives down the road.
Then conversely, today it seems that filmmmakers often assume their series or movies are consumed on headphones or loud TVs