“If a little kid ever asks you just why the sky is blue, you look him or her right in the eye and say, ‘It’s because of quantum effects involving Rayleigh scattering combined with a lack of violet photon receptors in our retinae.’” — Phil Plait, Bad Astronomy
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I think that answer is only a more complicated way of saying “it just is.”
Other than the fact that it acknowledges that there is an answer, it is probably worse.
Yes, and I don’t feel that descriptions of what has been observed, no matter how fine the level of detail, actually answer the question why.