[lomnakkus]

For the hard of hearing, non-native speakers who are used to subtitles from non-dubbed movies, etc. etc. I suppose.

I do know that, as a non-native English speaker, I've always appreciated having English subtitles for English-speaking films. It helps immensely if you miss a word, there's a little too much mumbling, or whatever. One of the best (in both ways) examples being the movie Snatch.