I'm so with you on your "they're making it up as they go along" Lost theory! ;) I still remember them in s1 saying something like, "There will never be time travel in Lost!" (which is probably news to all the characters who've been, you know, time traveling this year, lol! ;) )

But that's not a bad thing at all, as you pointed out. It would be far worse if they had a really rigid Plan That Must Not Be Deviated From that didn't allow for actor chemistry and just plain old sudden strikes of "Hey, wouldn't it be awesome if--!" moments. :D

*squishes!* ♥!