Set backcountry search and rescue aside for a second. Seems to me this is for ordinary people doing ordinary things outside cell range, and finding they need help. A family member has a heart attack. A collision with a moose. Who knows what. Less “should’ve brought water and a jacket” and more “we’ve been on route 9 for two hours, a moment ago everything was fine, now he’s not breathing, we have no bars, and we have…
Kim and his family were stranded on a rural route traveling from Portland to San Francisco. He went out in search of help and succumbed to hypothermia.
It was unusual, however there are "backcountry" incidents that don't necessarily involve intentionally setting out into remote areas.
I suspect, being a tech reporter, Kim would have had a satellite SOS enabled smartphone if it had been on the market.