This is only useful if the flavoring of the hot water is derived from solids that should not be in the final product, as in the case of coffee or tea. Not sure what this will bring to soup (unless the k-cup has chicken bone fragments in it?).
I agree. I don't see any difference from putting the powder in the bowl and adding hot water (even through a Keurig). Besides the marketing and sales opportunity, of course.
Same way you have flavorful ramen or cup a soup. Prepared broth, dehydrated.