You get plenty of opportunity to take up the 'checked baggage' option when booking tickets. There's always some who try to push the limits and get away with saving a few $. I'm glad they've cracked down on it. It was getting ridiculous the size & amount of items people were trying to bring on board. Agree that they need to concentrate on physical dimensions of bags too. It really p**s me off when you get to your seat only to find the overhead locker filled up already
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As for the weight issue, well it does seem unfair to be pinging a 70kg person for an extra 1kg when the fat bloke next to them weighs 70kg more and is effectively an extra person!! How you solve that problem without copping howls of protest from various groups about discrimination and being 'fatist' is beyond me.