This is the obvious "benefit" of hindsight. Yes, you accidentally had access to data that provided historical patterns you exactly could use.

But, for anyone who does, there is another 1000 who do not when something hits them: many illnesses develop gradually, and all of our tests (thousands of blood tests, scans and imaging tech...) would benefit from having historical data when we were "ok".

Similarly, you probably did not have more data than what Apple provided to help narrow the problem you still had, right?

And if everyone was put under so many tests, we'd actually be "solving" a bunch of non-issues for people over-reacting to small deviations from "normal" range.

Apple watch helps you with a few parameters — not to be discounted — but I don't really see it as a counter.