That's a good graphical representation, mc1.
And the original question is an interesting one, as well, rhetorical or not, since, for instance, compression will also fatten up a signal, but compression alone doesn't convey the same psycho-acoustic magic that a little hall and/or plate reverb does for voice, or that a bit of reverb and a touch of chorus can do for guitar.
This reminds me of the question: Why does toast taste better than a regular slice of bread?
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