People don’t just look at the TV for an hour straight - they are doing other things, or second-screening, or having conversations, and multiple methods being available to pick up on the show dialog is helpful.

Wouldn’t this make subtitles less useful rather than more? You can’t see the subtitles if you’re not just looking at the TV. For second-screening, it would be more helpful to listen to the audio while you’re also scrolling Lemmy or whatever.