Why does it matter that actors are mumbling, though? Don't most lines in Hollywood movies (that aren't already recorded on a soundstage with a boom mic inches from the actor's face) get ADRed these days?
Don’t make the art worse, hold the manufacturers accountable for selling terrible products.
Did movies and TV copy video games' Real Is Brown trope?
A big part of this is the viewing conditions. The best screen in the world will not make a dark scene watchable in a bright sunny room. And lots of people watch TV in bright sunny rooms.
Also, better screens = more money. A lot of the time, people just bought a cheap screen, and they would still like to know what happens in the series or movies they watch.
I am absolutely for quality interesting dark scenes in cinema, where both the screen and viewing conditions are normalized. But TV is not the same (and HBO and Netflix are TV).
Try watching handmaid's tale without blackout blinds.
If you want to watch a dark scene in bright light then you should have a button on your display/remote that adjusts the settings to make that possible. Tons of people have produced brightened versions of those scenes and put them on YouTube, it’s definitely possible. You can always remove dynamic range in post, hard to create it if the source material doesn’t have it though.
These scenes are poorly edited. I should not have to live-edit them with my remote while watching. I'll do a poor job, and it takes me out of the experience.
These edits don't "take advantage of" dynamic range; they abuse it.