How would you do it? I'm curious
Oftentimes the subtitles will display dialogue that is ambient or too faint to be heard amongst the other in-game sounds. Rarely does this yield essential or crucial information, but you get more of the flavor bits game designers put into a world.
For Assassin's Creed Unity, I changed the spoken dialogue to French and left on the English subtitles, since Ubisoft were too cowardly to actually include French accents on the characters.
Beyond non-gameplay reasons that some people may have legitimately everyone is different. Not only do I not find sound aiding that aspect for me, there are a lot of video game specific things from bad voice acting, repetitive sound effects, ost's that do nothing for me, and licensed music that outright annoys me that a lot of the time for me sound is immersion breaking.No sound? Man you're missing a lot of immersion?