Here's a (slightly comical) contrapositive argument. Not having the convenience of modern implements and having to resort to primitive methods you've learned will make you not forget to always have those modern implements with you all the time(from a been there, done that, don't want to do it again point of view).

Becoming proficient at primitive skills makes you appreciate the luxuries of technology all the more. (Try to) make a fire with a bow drill and damp wood, and you will obsess about bringing matches or a lighter (or both) with you from then on.