Depends la bro. Not everyone have good brains and ears like you.
Plus, what about people with hard of hearing and wearing hearing aid?
They want to watch movies too.

Some movies the audio mixing is so bad, can barely hear the actors mumbling example in Insterstellar.
And some movies/TV series use heavy accent like The Wire.
Try to understand the ghetto language used by Stringer Bell and Omar, sometimes you also scratch your head.