The worst problem is WSG itself is not only just rules pulled from thin air, but it is utterly unplayable. If you actually ran an overland wilderness adventure using those rules it would require 100 dice rolls for each day of travel. Chances are something would go terribly wrong by day 2.
I mean, clearly, at most these rules would only ever be applied in some especially dire situation, or simply to establish color, like using the shelter rules to describe someone camping out, but not actually applying the rules as such. Do we need a 150 page book to tell us what a tent is like or that your campfire can get out of control?