Of course there's positive feedback, just look for the drool ha ha ha. Pavlov reference. Sorry, let's get serious.
** A light system produces "warmth" or more "warmth"?---just because you can move faster? Warmth in the winter comes with more weight, period. Heavier bag, beefier pad, gloves--hats--parkas--more fuel, etc.
** Ergo a light sleep system and light clothing may look good on the gear list or spreadsheet but may be cursed in real world conditions at -10F. In fact, the biggest winter problem I see with backpackers is their unwillingness to carry enough clothing and enough bedding/pad. It reminds me of Jordan's Arctic Trek when he had to wear his foam sleeping pad around his torso for warmth as he hiked. Why not just carry some extra fleece and merino?
** More miles? This seems to be an UL mantra and part of the fast and light mindset. Seven mile days are perfectly acceptable. What's the rush?
** "Fewer days between resupplies" is to me the biggest drawback of a light kit. I just left a town and cars and folding money and traffic and roads to go into the woods so why the heck would I want to interrupt my trip with near constant resupplies? So, I carry more food weight and stay out longer w/o interruption.
** You say you have better site selection because you can do more miles to find a site but to me this means a UL kit dictates camp selection, a negatory in my opinion. Maybe some of us want to sleep in a windstorm on a high open bald in a blizzard.
So, the positive feedback loop might only be relevant to a narrow group of individuals.