So what & who cares ?
I take all claims of battery life with a large block of salt.
A good rule of thumb on notebooks is to divide the claim by three.
In reality it just doesn't matter because power points are readily available for most users.
In fairness to Apple their battery claims tend to be more accurate than most & often better than specified. An iPhone 6 Plus 128GB is on the "buy list" when the current O2 two year deal concludes in January. Eye watering price but will get several years use not as a phone but as a mini mini iPad/iPod touch.
As for the Apple Sports Watch - articles on battery life have long since died.
Get two to three days between charges.
Not as good as the Citizen ECO which is solar powered & radio controlled.
Better than Rolex Explorer II which needs winding daily.
Plenty of good choices these days but you can't please all the people..........