Why should he?

To me it is not amazing at all. What amazes me is that people keep ignoring the fact that the current sound is not final so there will be a new sound coming from the developpers anyhow, that in the future players will be able to mod their game so using any fancy sound files will be possible without passing by the devs and that very likely the sounds developped by somebody who is no expert of the game engine and has not the slightest insight into it and despite his competences may just be not good for a game feature with the dev stamp on it.