So much aggression in your post.
Before posting, keep in mind that everyone has an opinion that is worth not less, but at least equal to what you just said. If I would react in the same emotional way now, we would never have the chance to know each other, and this is an anonymous Internet forum where it should always be welcome that there are people with different opinions, which is normally the majority reason why people visit them in the first place.
It's simply useless for me, since I don't need a tracking device that shows me my health. Humans have ways of identifying if they're in good health. If you're not able to do that then apparently you need these features. I definately do not. It's just my way of living and so it's just my opinion, since I can do just fine without 'em. You do not have to share the same opinion, and you made pretty clear you're on the other side of the wall.
Same for 80% of the other services that run on any phone in the background that collect information, I just do not need or like it, so I press the killswitch. More battery for me, less charging, it's a win-win.
Same reason I do not need an Apple watch, since I quit "watches" some years ago and never looked back. I know my time and I trust myself, why should I need a watch to tell me what to do?
PS: I am aware there's a percentage of people who have a serious illness that is not easily detectable - it's good there's a choice for everyone, isn't it?