Existing watch heart rate sensors are next to useless IMO even when they work. I've always been skeptical of fitness features on watches. But continuous blood p

Existing watch heart rate sensors are next to useless IMO even when they work. I've always been skeptical of fitness features on watches. But continuous blood pressure and glucose monitoring would definitely be worth buying and wearing a new watch. Maybe even switching from Android to iOS if it was Apple exclusive. I'm a little skeptical that it's possible to get accurate absolute measurements of those things purely optically, through skin and hair and while the body is in motion, across all skin types, ages, etc. That would be pretty magical.