I'm into their description of the warrior as an archetype in and of itself, and I'm inclined to agree. Klaus's elaboration of "self reliance" is pretty great, too. I also find this mashes up well with D&D history, when Fighters had the best saves: nothing phases a fighter. They are determinators. In exploration, they wade into the thorny vines and cut their way through, they keep marching long past the point of exhaustion, they bend bars, lift gates, and beat down the door. In interaction, they are no-nonsense, not easily fooled, and strong-willed.
Where barbarians are superstitious, fighters are practical. Where monks are esoteric, fighters are concrete. Where paladins are lofty, fighters are realistic. Where rangers are flighty, fighters are reliable. That's not a bad archetype.
I also wonder how realistic it would be to run a NEXT game where the only abilities you ever received were in the form of treasure. Wizards had no spells, fighter had no maneuvers, rogues had no tricks, unless they quested for them....I find the concept strangely alluring.