I could see down the line how measuring continuously vital signs and blood work could help us detect or prevent illnesses or risky behaviors, but the complexity of its analysis will demand something a lot more intuitive than a dashboard. As of now though, these are all vanity metrics, just as useful as tracking the number of visitors landing on your front page.
I appreciate the car analogy, but if you car were as well designed as your body, you would not need a dashboard. Getting more sleep, controlling your food intake, getting more exercise, drinking less... It doesn't take a dashboard to know when you should act on it; your body let you know naturally. You get fat, tire easily, yawn, feel like your overate.
Knowing what to do isn't the hard part, your mom probably told you everything you should be doing since you were able to take your own decisions ("Don't stay up late", "Go play outside", "Eat your greens"). But as pretty as our tool is, I see this as useful as the tons of gadgets and fancy sport gears I see people wearing at the gym: a palliative which distracts us from the real hard work.
