This reminds me of all the posts in photography forums about how Photoshop takes away from images and that photographer should "get it right" in the camera.
On topic, I've never noticed anything unnatural about Diana Krall's voice on recordings, but then I haven't sat in a room while she was singing and heard her natural voice without amplification or other effects. I fully expect that the team involved in recording the music will (and should) use whatever tools are at their disposal to get the end product they want.
Even live recordings often have studio overdubs and editing.
On topic, I've never noticed anything unnatural about Diana Krall's voice on recordings, but then I haven't sat in a room while she was singing and heard her natural voice without amplification or other effects. I fully expect that the team involved in recording the music will (and should) use whatever tools are at their disposal to get the end product they want.
Even live recordings often have studio overdubs and editing.