I feel as though with a purpose this focus technique doesn’t make much sense. It’s not how our mind works; attenuating volume is not based on where we are looking and our head position in space. It is, however, a great way to drive narration and the story in the space. At that point the value becomes clearly presented in the UX and serves a function. Clarifying the reason why it’s introduced in such a way. In the end we are still telling a story, just with sound.