I agree with you generally except regarding the heart rate sensor. Even for your father, whilst it may offer him some placebo effect of re-assurance, its usefulness even for those with heart conditions and i speak as someone who has been on heart medication for years is not really advantageous. If you have had any heart disease or attack you should be on medication for the rest of your life and even if you are reading normal heart signal, that alone is actually not indicative of your chances of a further attack.
As i actively monitor my heart rate using a proper chest band each day whilst exercising and from a fit bit blaze everyday I know that based on readouts and tracking they are calibrated very accurately and are far more accurate than any heart rate result i have got from my S5 onwards (S6e, S6e+, Note 4, Note 5, S7e, S7e+ ) which are a one shot readout rather than continuous which in itself is flawed as it provides only snapshots of data and not continuous ....
There is a reason why they strap people to an ECG machine and do it over a period of time rather than for 3 seconds for a 'single' baseline reading..
The heart rate sensor on the Samsung phones are provided flawed inaccurate & placebo fake re-assurance rather than genuine useful data and read out accuracy ...
We will have to agree to disagree for now (I need sleep!).
Yes, of course continuous chest band monitoring with the best equipment is preferable, but if you're talking about the level of accuracy the S7 has, it's generally considered incredibly good as a snapshot. It's FDA approved, many of my friends are doctors and they are shocked by the accuracy, and I did quite a bit of research into this a few months ago.
You're right about the nature of monitoring, and different people have different experiences with any equipment. But the Fitbit Blaze (I had one for 6 months or so) was nowhere near as accurate as the S7 or S6 sensor. Now obviously it's a slightly artificial way of measuring - to literally stop what you're doing and put your finger on the phone as opposed to continual or automatic hourly monitoring. However, any form of monitoring needs an element of bias included because even an ECG will provoke a considered response from the subject who knows they are being watched.
But if you're simply talking about the accuracy, the Samsung does an excellent job. And snapshots can still be very useful, especially as smartwatches/fitness trackers basically give BPM and even that tends to be variable. And I could do that by placing a couple of fingers on my Dad's wrist!
It's an interesting topic, anyway.