Most of the time, natural sibilance is not really a problem and I understand that it is part of the way we make speech. But I think the problem is that most digital playback would add a layer of electronics which results in a sound that is shapeless, formless, noise-like, to the "s" or "shhh" sound especially with female voice since I guess it has a more high-frequency contents(the area where most digital playback has problem) than male voice.
