You may very well be correct in terms of the 'lunatic fridge' SUL mindset folks (which I consider myself part of), but I bet the complete walker's cover photo still represents the majority of walkers today!
One of the threads associated with the recent SUL articles someone made a comment something like “now that UL is main-stream”. That sure gave me a chuckle because I see more complete walkers on the trail than I see UL / SUL walkers.
My son did the Duke of Edinburg (DoE) award this year, and they are still mired in a heavy mindset. My son does a lot of UL with me, and his best friend’s dad is an adventure racer, so we tried to set ours sons with the lightest possible gear while adhering to the DoE guidelines (heavy boots - cringe!), and the staffs were still close to accusing them of being unprepared.