I prefer accurate sensors over many sensors. My last watch would measure my heart rate to be in the 140s while sleeping. I have since slept with a chest strap

I prefer accurate sensors over many sensors. My last watch would measure my heart rate to be in the 140s while sleeping. I have since slept with a chest strap heart rate monitor and do not in fact have a medical condition. Granted, that was a cheap watch, but I still don't see the use case of a smart watch for health tracking versus phone+100$ chest strap. I believe the usefulness of these kinds of devices for health tracking is vastly overstated due to lack of accuracy.