I go the woods to escape everything. No contact with the outside world, no work, school, anything. My purpose is simple: walk and enjoy. That I intricately plan trips down the gram, count caloric densities and can put on 35 miles a day does not detract from my purpose.
It irks me when I see people on the trail not enjoying their hiking. Their packs are so loaded down that they cannot possibly be having fun during their walk. Their fun comes when they are sitting in an artificially-cleared area in a forest. But to get there, alas, that is not fun.
My purpose must be fulfilled in every scope of my walk. Everything I do must be focused on that purpose with an eye toward efficiency. If I need to take 30 minutes to rest my feet, then so be it – it will save me rest (and injury, maybe) time off later.
I am still working on this. I have recently been tinkering with a poncho/tarp and have yet to figure out an efficient system storing and attaching guylines to prevent Triptease rats' nests.
A lightweight back, through inherent benefits, gets me to that purpose with the most efficiency. Although I do not see myself as the personality type that Richard quotes, the last sentence hits me hard.
Maximum efficiency is applied to many a thing for, however, is generally applied to only things that are capable of calculation with few exceptions. I weigh each item down to the gram and record it in a spreadsheet and make derivative lists from there. I have started to meticulously record fuel weight for my canister stove. I use a program keeps track of my run distance, time and pace. I use this to track progress and to make sure I am running efficiently. I try and apply this to my pocketbook, although I am less successful there. At least I recognize my shortcomings.
As a law student, efficiency is drilled into me from day 1 of classes. I must manage my time, read effectively and communicate in concise statements. Because of the logical system that underlies legal analysis, my brain never moves out of lawyer mode. I apply logical analysis to out most things with thinking, almost like a set reflect to an specific exterior stimulus. I can't help it. Lightweight hiking just makes sense.
To quote Chuck Palahniuk (Fight Club):"[T]hat which does not matter, truly slide." Unnecessary items in my pack must go, and it frees me to fulfill my purpose.