Hyperbole is Apple’s favorite communication style, but at this point it’s so overused that it’s just a meaningless meme. Apple’s wearable competitors blow the Apple Watch’s battery life out of the water and it’s not even close. Hyperbole is all Apple has in this race.
On the flip side, Apple blows them away on feature set, and often on data accuracy. There is give & take, different priorities for different people.