I can see how some might be concerned. For myself, I'm not worried about anyone knowing where I am....as a matte of fact, it could come in handy at some point, though I hope it never does... I'm imagining some mishap on my part...and my being found (alive and reasonably well, of course) via my iPhone's tracking.
As I get older and become more frail I am becoming less annoyed by the thought of being under a watchful eye. If I go missing because I had a heart attack or a stroke, I want someone to be able to track me down.