Using all of the same logic from the article, why is there no Poop Tracker? In fact, not only is it the most diverse, easiest to understand health indicator from the human body, but it is the same for all humans. It is The diagnostic report on literally everything you do.
The period tracker is a no brainer, but a poop tracker might actually make your life better. I think, though, that most people want a flashy looking chart and a conversational set piece. Health Care is treated more like an insurance policy and lesss like an habitual practice.