You can certainly start a fire with a magnifying glass, but how often do you really need a fire when the sun is high in the sky? When you really, really need to start a fire, it will be dark, cold, and damp. A Bic weighs less and works in more situations, as do many other fire starters.
I mostly agree. The exception I think of immediately is hypothermia. It doesn't wait for the sun to go down, jusy ramps up it's nastiness. It's colder at night but hypothermia can happen any time if you're not careful and you can be hypothermic even if you feel warm and dry. (see what I did there?) If you're smart and lucky you can avoid it, but the sooner you can nip it in the bud the better.
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