I wouldn't go QUITE that far. but out of the box, I agree. a GPS phone needs additional accessories to make it fit for outdoor use.
another problem I see is that since smartphones are so popular, they put GPS tech in the hands of people who are spatially clueless. I've seen it often enough myself. People who cannot read a paper map are usually the ones who manage to get lost when they are using a GPS.
grough — Mountain rescuer: 'GPS phones only any use for urban walks'
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