Apple Watch has one of the best optical heart monitors, but the technology is flawed.
I can provide links that claim that Garmin has better heart rate monitors. The truth is that the results are different for different people and environmental conditions.
In my and my wife’s cases, the heart-rate readings are inaccurate outdoors when doing aerobics activity (brisk walking, running, roller blading). Neither are the heart-rate readings accurate during strength training indoors. The readings are all over the map. At rest, the readings are accurate enough most of the time, but sometimes they are ridiculously off too.
For others, the optical heart monitors may work much better. This technology has very different success rate for different people, different climates, etc.
All I was suggesting was that Apple should put some R&D into improving the heart-rate monitor accuracy.
Are you claiming that this tech in the Apple Watch is at such a level of perfection that any additional R&D would be an absolute waste of time and resources?