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 ...