As someone who’s used basically every smart and fitness watch out there, I can tell you that this is totally not true. So long as you’re not looking for something super fitness focused (in which case go for the garmin, Coros, etc) then the Apple Watch is unparalleled in how good it is at being a smart watch AND how trustworthy the fitness data is. It’s literally one of the best optical heart rate monitors out there by a long shot