You use whatever resources you have available in a survival situation. The modern gear saves time and makes staying comfortable and fed easier. The longer the timeline of the event, the more primitive skills can become important to replace used up or lost modern gear. If you run out of beans, bullets, and bandaids, or are forced to abandon your gear, or lose it, then the primitive skills will enable you to increase your odds of survival. Primitive survival skills need practice to attain proficiency at them before the need arises, and they can be difficult to learn due to much misinformation, like Mr. Bishop in the prior post pointed out about the correct way to throw a bolo, where the books, which all seem to copy each other, teach a way that doesn't really work well in the field. To carry a survival book in your BOB to use when the chips are down is about as effective as carrying a karate manual in your pocket in case you are mugged. I have studied and practiced primitive survival techniques for around 35 years and assure you there is no graduation day, before that I was an equipment camper for 20 some years. The two actually meld well with each other, as I carry my modern equipment and have my primitive skills between my ears. It's autumn and the acorns are falling, go get some and try them out as food, then sharpen up your bow drill fire building skills. If the bow drill is mastered, then try the hand drill. When you go wilderness wandering leave one piece of modern gear at home, and learn how to replace it from what you can find outdoors in your locale. Eventually you will know how to get along without any modern equipment should the need arise. Train, train, train, your life depends on it.