How are the polar watches at handling notifications, communications, displaying calendar info or utilizing custom apps?
Most of us don't really need to track our heart rate anyway, and never gave it much thought until fitness trackers with HR monitors dropped low enough in price for the feature to become a value-add. Cheaper fitness trackers with no HR capability are still insanely popular because many people just aren't willing to pay for heart rate monitoring. Most people just want to track their steps.
The target heart rate zones recommended by the American Heart Association are so wide that it is really hard for most of us to over or under exert. Of course elite training regimens will have more narrowly defined zones for different stages of a workout. Doctors might also want patients with certain conditions to keep it within a narrower range. If you're a heart patient, you need more accurate real-time readings than most of us do.
Most people are perfectly happy to wear a watch with a heart rate monitor all day long, but not everyone wants to wear a chest strap, even if just for a one hour workout. My Apple Watch heart rate numbers seem reasonably accurate and reasonably consistent enough of the time to give me some useful trend data. the only frustrating thing for me is that sometimes during a workout it will stop displaying real time HR and I will get the "calculating..." Message for a bit. Oh well... Not bad considering the convenience of not needing to wear a strap. I'm not saying I won't welcome improvements. It's just not as useful of a feature to me as it is for some.
Sean