It sounds cool but I don't think it would change much practically. I have hypertension and a BP monitor is cheap and easy to buy and use. We have plenty of data

It sounds cool but I don't think it would change much practically. I have hypertension and a BP monitor is cheap and easy to buy and use. We have plenty of data on how a measurement taken at rest correlates with CVD risk. I think the big advantage of watch-based health monitors is that they can find problems in people that don't already know they have the problem. You already know you have hypertension so you monitor your blood pressure, many people don't know they have it. The same is true of non-invasive glucose monitoring if that becomes viable to add to smart watches -- you may still need to wear a continuous glucose monitor if you have diabetes to monitor your blood sugar, but the watch may be a good early warning that you have a problem.