Trend Longevity Rating
became core infrastructure in health care, often bigger than the book imagined
How this trend held up
Wearables didn't just persist — they multiplied. The Apple Watch, Oura Ring, WHOOP, and continuous glucose monitors marketed to people without diabetes have made self-tracking dramatically more mainstream than the Fitbit-era devices the book describes. And the specific worry it raised — that data without interpretation is just noise — proved durable enough that fixing it became the industry's central design problem for a decade, addressed only recently as AI-generated coaching summaries (on Apple Watch, WHOOP, and Oura) finally started doing what Jody Ranck told the authors in 2013 the industry still couldn't: turning numbers into advice.
Every past trend prediction is re-reviewed and graded with a Trend Longevity Rating, measuring how much each originally curated trend still matters years later.
