1) When viewing movies at 2x slowed down speed, the days when you just played back audio an octave lower/higher are gone. Well known software can play audio at various speeds while keeping the same pitch. There are plenty of times when there is audio without much, if any, speech going on. In those cases the played back audio, at the same pitch, would sound natural enough.Genuine question from a non-video guy. Why would you want to record audio in slow motion video?
2) There will be times when you want to play back 120fps movies at 120fps, based on future technology becoming more mainstream, and having the audio gives you that ability.
3) You could play back the 120fps movie at normal 60fps speed (no slow motion) by 2x downsampling time-wise the video & audio, and then you're getting the same video with sound as if it was 60fps to start with. But when there's something you want to show in slow motion, you still have the slow motion smooth video for it and the "as good as you can make it" audio to go with it.
4) Audio takes almost no storage compared to video, so why not record it? It won't make much difference to the storage needed. And then you can get the marketing buzz at the very least.
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