As with heart rate monitors and GPS trackers in consumer devices, such monitoring may not be 100% accurate. But any new information is good when it comes to fitness and health wearables, so we aren’t complaining.
It looks like these features are globally rolling out unlike the Watch 3’s ECG feature that is only approved for South Korea. The Apple Watch has a similar feature that can detect arterial fibrillation and has reportedly saved lives by recognising potentially fatal heart conditions prematurely.
If the Watch 3 can get the ECG feature switched on globally (the hardware will ship on every watch but the feature must be turned on regionally by Samsung in software) then the Galaxy Watch will be able to match the Apple Watch for most features.