Quote Originally Posted by Desert Merchant
The thing I dont like about the mission style games is that you need to follow a guide otherwise you miss some stupid detail and do not get to see the full story...ahem cough X-2
That was only because FFX-2 had multiple endings. As far as I know, FFXII does not have multiple endings so it's highly unlikely that you'll miss parts of the plot because you forgot to press X at the right time. There will probably be side quests that expand on the plot in some way, but that's nothing new.