The reason you have to watch your streaming shows with the subtitles on is because the streaming companies fuck up the sound mix (probably to save money) https://www.theatlantic.com/ideas/archive/2023/06/watching-movies-tv-with-subtitles/674301/
How Subtitles Took Over TV

It’s not just you.

The Atlantic
Here's Why Movie Dialogue Has Gotten More Difficult To Understand (And Three Ways To Fix It) - SlashFilm

/Film spoke with several Oscar-winning sound designers, editors, and mixers to learn why it has become tougher to understand what characters are saying.

SlashFilm