Zor,
Two objects can weigh the same, but the force it takes to accelerate them to the same angular rotation varies based on the distribution of the weight. Think dumbbell, with the weight on the end vs same weight concentrated at the center. Low polar moment, though I guess being from Canada Polar might have a different meaning.
Sorting ribs by weight puts the heavier ribs in the center of the wing if constant chord, but even when tapered, you can balance a wing with careful selection of which panel each pair of ribs go to. Same with all the other pieces that go in the wing.
Probably a good indication that I am "one of those that frankly never will".
Dirty Harry said it best - "a man's gotta know his limits"