So, and apologies if you are independently wealthy enough to not work or have a business to generate the income required to buy gear, food, transport, lodging, etc, how (or how long) would you survive just hiking and doing nothing else? The true fundamental difference is that only one, what most of us refer to as the real world - the one where you generate an income to feed and clothe and sustain yourself and family, can exist independently from the other. So which one is truly real? It isn't realistic to live hiking in the woods with no source of income. Never has been, never will be. Going off hiking is a recent, modern recreational phenomena. It's not a return to the past nor is it a sustainable existence. The trails we know were blazed specifically for recreation, on lands sequestered for conservation and/or recreational purpose, most as an escape from the modern industrialized world. The gear that enabled us to do so was designed and manufactured from materials brought to us by modern industry. Historically, people took short walks to be sure, but the only reason people went off on LONG hikes into the woods or wilderness was because someone with money paid them to do it to explore for land or resources or glory - or to hunt for homesteads or food. Very few did it just for the fun of it. Not so long ago, the wilderness was not a comfortable nor forgiving place - it's only the handiwork of the real world that made hiking a pleasant recreational endeavor.
Except for the carbon bootprint of getting to and from the trail by plane, train, bus, shuttle, etc; the manufacturing of the gear and clothing; the processing of all the processed food; the burning of firewood and stove fuel; and then add in the footprint left by creating and maintaining the trail and park infrastructure. It's not as small a footprint as some might contend. Hiking is a consumer activity.
Except that you simply spend the money required for subsistence in advance, rather than day to day.
The charities you speak of are only partially from charity - the tax dollars of US Citizens have paid for most of our parks and trail system and their maintenance. Typically that hitched ride doesn't really represent a high value to the giver either. And while dumpster diving for discarded food and gear as you suggest may appeal to some, I don't think most would find such a life very fulfilling nor meaningful - if more people did so, that resource (brought forth from the world of food producers) would not remain so easy to find. While you may be able to live this way, it isn't a model that can be sustained by large numbers of people, even if they wanted to.
__________________________________________________ _________________________________________
Hey, there's nothing wrong with thru-hiking. And if one can afford to, there's nothing wrong with doing nothing but hiking and living in the woods if that's what someone likes. But spinning a hike financed by income, using equipment, and on lands and trails that are all products of the REAL world into something more than what it really is just isn't a very believable argument.