There may be a place for it. Transporting it to places hit with fast acting devastation is one. I can see how it would be useful in "putting the tiger in the cage." IOW, when someone quits cigarettes, drugs, etc., they can put it down and never touch it again. The same can not be said about nourishment. So someone who eats for emotional reasons rather than for nourishment, might be able to eat this way for long enough to stop associating food as a pleasure in times of stress, anxiety, or sadness. Under supervision, the person could then slowly introduce real food back into his/her life, or could choose to stay on the powder for the rest of her/his life.
I doubt it's optimal, but I think it has potential to be useful. Real, healthfully raised food is probably best. It would be sad to give up steak, asparagus with hollandaise, coffee, fresh raspberries, etc. I mean really, if a beautiful man/woman were available to you, would you choose the powdered one?
Also, if anyone ever needs my dead body to nourish someone else, they are welcome to it.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine