I think we're talking about two different things.
You're saying that some devices are measuring "resting heart rate" when it's not using the traditional definition, and comparing that number to the traditional definition is wrong, and I would agree.
I'm saying that the traditional measurement of resting heart rate is bad for a variety of reasons, one of which is that taking it while sitting at your couch at home after 15 minutes and having a stranger take it in the weird doctor's office can have very different results. And if our smart devices consistently measure an RHR on a regular basis, that's probably a better measurement of progress.