An EKG is done via a 12-point lead at specific areas of the body. At the moment, there is only one ECG sensor on the watch. When I told my SO who is currently in medical residency, the look on her face was of pure horror. I think to physicians and medical professionals, all this feature will do is to create more false positives and needlessly clog up already stressed clinics with wasteful checkups and add to the number of hypochondriacs.

Maybe through ML Apple could enhance the accuracy and precision of the measurements but given Apple's history with iterating on intelligent features(Siri), it won't happen for a while. If Apple wants to have a meaningful impact on the health of their users, then maybe they ought to use the ECG sharing feature as a means of getting their foot in the door of the medical records industry where their product approach and design rigour is much needed. Moreover, Apple could leverage the ECG feature as part of the product experience to motivate people to engage in activities that get them moving which, at the end of the day, is where most users derive the most value from.