Insane, particularly because no one (or maybe only 1 person?) in this entire thread has suggested what you wrote above. There has been no "Person A" in the comparison, only Person B and a Person C who carries on both a rollaboard and a small bag. The "demand" has been that Person C should make an extra sacrifice (compared to Person B) by putting his second, smaller bag in his footwell. I don't see any insanity to that proposition, and I don't think you will if you do your onboard footprint analysis between B and C either, not the imaginary victim A.