You have your whole luaggage scanned, body scans, fingerprints, passport and even custom officers asking you where you stay and god knows what background checks are going on, but weight is gonna be an issue ?
Fair, it doesnt change the reality tho, its just a number whatever that number may look like.
I dont agree with that proposed practice either, in fact i would be more happy if we wouldnt have to go through most of the "safety" procedures they put in place, but its not going to change my choice of airlines because i book whatever is convinient and affordable.