I think it depends on how you read "life or death" if you take it to making sure decisions are made about it early and the fact a response will take time. Ie after cold water exposure before hypothermia sets in. If your lost and the only issue is your hungry it's a bit different to your lost it's raining and you have no shelter and will likely become hypothermic overnight. I do think it's should be made only for life and death situations but that you should be realistic about what could be life or death ie dont wait till you are on deaths door and required response times, whether over time your ability to make rational decisions will decline.
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