Wrist Heart Rate WRONG

HI, Garmin really need to address and fix this issue first. All the data and metrics are calculated based on WHR. If this is inaccurate and unreliable all the other issues don't matter. I don't buy the fact that you should always wear a Heart Rate Strap for activities. What is the point of an 800 Dollar watch if this is the case? I understand that Optical Sensors have some limitations but even my cheap Fitbit did much better and my Vivosmart 4 too!