"We've had bathroom scales for over a century, yet as a society, we are more obese than ever."

Exactly! Couple decades ago they blamed human stupidity on lack of information. Look at us now with all the data available at our fingertips. We are so well informed that we should be better humans but we aren't.

Coming back to the Apple Watch (and alternatives) perhaps what we need along with all these "insights" are a shock collar (yes, like the one for a dog) that serves as a motivation to get off one's ass and get in to better shape. I'll bet that'll sell like hotcakes /s