I don't know these people, nor do i know there experians level. But being focused on one thing, either equipment or weight, doesn't make something right or wrong. The keywords are experians and knowlegde. You can have all the equipment you want, but without the proper skills, you may not survive. If you have enough experians and skills, you can easily get by, with less. just look at those survival instructors or people at advanced survival training/courses. And the beautiy of experians and skills, is that it doesn't weight anything.