This is what makes me a light hiker and not ultralight. I could be UL very easily if I didn't carry my preparedness gear. My wilderness EDC is an extra pound or two of base weight. Put into the context of what he doesn't carry and how he eats, there is no reason in his mind for a knife. YMMV

He is a RayWay guy. Nothing wrong with that but I am guessing from his site he is more into the long hikes on established trails and living in a self sufficent bubble that precludes having to cut anything. Though even Ray says he carries a small swiss amry classic or some scissors.