As I have said in other threads, I'm not a dryer lint fan. It works ok at best but is very poor compared to things I can readily find in the woods where I live - without having to pre-prepare something.
Many of these survival techniques got their start from people applying them once and passing it on. Never having to use them under adverse conditions or practicing under such conditions. Nothing, and I do mean nothing, beats experimenting in all types of conditions. The little SAS survival manual is filled with shit that doesn't work a lot of times, or at all. For example, the technique of starting a fire from striking a piece of flint on an axe head. Bullshit.
In the end, reading will get you killed. Actually learning and perfecting the skills through practice is what will keep you alive. Train. Even if it's in your own backyard. Start a fire then pour a 5-gallon bucket of water over all your tools, your hands, your tinder, yourself, etc. and then train some more. Just because you can ligth a fire under good conditions with a certain tinder or device doesn't mean you will be able to when the chips are down.