Exactly, if they do reach their goal of deploying tens of thousands of these machines allowing everyone to scan their body frequently and cheaply then even if there are limitations to this technology it will still provide a massive amount of longitudinal data about the human body and the impacts of lifestyle, age, pharmaceutical effects, etc.

The person you replied to mentioned diet and exercise, that seems like an area that would benefit directly from this type of scan. Being able to track the effect on body composition in a highly accurate way where we know exactly how much muscle and fat are gained or lost and where that's happening could tell us a lot about not only the effect on the "average person" but for each individual. I'm sure there are many other less obvious things that could be tracked using this technology.