The FDA just slapped Whoop with a warning letter over their blood pressure feature. Here's why this matters for everyone in health tech. Whoop launched Blood Pressure Insights in May, claiming it's just another wellness metric like heart rate or sleep tracking. The FDA disagreed. Hard. They're saying blood pressure estimation is inherently medical and needs proper device approval. Here's the thing: both sides have a point. Whoop users pay $359 for their premium tier specifically to get these health insights. The company isn't wrong that we already accept heart rate and respiratory data from wearables without medical oversight. But let's break it down. Blood pressure isn't just another number. Dr. Ian Kronish from Columbia's Hypertension Center put it well: there's real concern about accuracy because people make health decisions based on these readings. A wrong blood pressure reading can literally be dangerous.