Becuase it is a technique that requires a lot of knowledge and experince. What kind of woods are right, where to get them, how to shape them, how to use them, that kind of thing.<br><br>I know less technologically based methods, but I've also voluntarily chosen to use them as my primary methods on many camping trips over many years, saving my matches for a real emergency should it arise. And guess what- if the stuff hits the fan, I don't trust my skills to build the tools and get a fire going before I freeze to death. <br><br>These skills have thier place, but not the "casual survivor" (someone who usually doesn't plan to, for example, slip on a trail, sliding down a bank during which time they break thier leg, and end up with a 15' drop into a frozen over pond, and/or give up 3000 years of civilization and go back to the stone age on thier own). These are skills for a long-term situation, which is just about impossible to get into these days. The casual survivor should be learning how to use a PSK and to signal for help long before they start making stone knives and spining firebows. <br><br>Not tring to take you off at the knees, it's just not a technique that in a true survival situation you will have TIME to use, much less need.