I don't think I need hearing to survive. I do need my sight though.
I mean with no vision your essentially a veggie. You can't walk around anywhere except maybe your house (after tons of training and missteps). How do you get to the bathroom, or dress yourself, or play videogames? These are all kind of important things.
Can't hear, well you can still read/write to communicate. Plus you can still drive, play videogames, fuck girls ect.