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In the years I've been alive, I've had very few accidents.
In those accidents, I've never been rendered unable to call or walk away from them.
I suspect very few exceed my averages, really.
This is a feature that Apple adds for publicity's sake with an incredible level of risk to failure, with almost no realization of benefit.
"In the years I've been alive..." Thats kind of the point. People that are in severe accidents and are unable to call are frequently no longer alive if they don't get immediate assistance.