>Now if Apple can make this more accurate, then great. But if this saves even a few lives, then the fact that 9 out of 10 warnings are false positives still seems extremely worth it, no?

No, not by a long shot, because physicians are a pretty rare commodity, care is expensive and sending nine out of ten people to the doctor for no reason is a huge drain on the system and public healthcare resources.

if you see this as success I don't think you're familiar with the concept of opportunity costs. For people who don't have any symptoms, have no history of heart conditions or other underlying risks, running around with an EKG on your wrist is absolutely ridiculous. All it will do is inflate healthcare costs with little improvement in outcome, which is already the primary disease of the US healthcare sector. And of course apple's and the healthcare sectors primary motivation to sell these things to begin with.

Not every cardiac condition even requires immediate attention by a physician, I wager most of the anomalies that show in the 10% are benign arrhythmias that would have been picked up on a yearly routine checkup in due time.