:) When someone plans to benefit from group gear and claims they just don't have enough space in their pack... that's when bust out my collection of straps, bungies and string. It's cool, you don't HAVE to fit it. We'll just tie it on there for you. Complaining? Ah, turns out we do need the Coleman 2-burner...
OF COURSE, it's better to adjust loads and ditch surplusage before departing the trailhead. And, while at that trailhead or the shakedown meeting, and once it's established that absolutely nobody is carrying more underwear or layers than the PC crowd have determined is correct, and the crowd has overcome the blame game for those who didn't buy the Western Mountaineering sleeping bag that weighs only 15 ounces in the midget size, and the discussion over whether that 9-inch Rambo knife is really gonna be of use has been completed, and someone's come into acceptance that "some people" might have sleeping pads weighing more than 114 grams, then there may come a time where allocation of group gear might properly involve some allocations and acceptances beyond "divide the weight by the number of people".
At least it does among those I'm willing to backpack with. No PrimaCommieDonnas need apply.