The Estill Voice Model isn't trying to kill the metaphor. It is trying to give you a to fix the metaphor when it breaks.
The "Craft" of the Estill Model is taught through , which are exercises designed to develop conscious, volitional control of 13 specific anatomical structures. the estill voice model: theory & translation
For centuries, voice training has been ruled by ghosts. We’ve all heard the phrases: “Sing from your mask.” “Send the sound to the back of the hall.” “Imagine a column of cold air.” The Estill Voice Model isn't trying to kill the metaphor