[utyop22]

No that is not the reason.

People watch Netflix to switch their brain off - having the text there helps along with the visual and sound to deliver the content. However, text is inferior to both visual and sound as a delivery mechanism.

[keanebean86]

Subtitles increase the signal to noise ratio. At least in our house. We have to keep the tv low to not wake the child. A volume of 10 with subtitles is similar to volume at 16 without subtitles.