Do any of the side quests contribute anything to the plot? I know it's post game but in my funny little head the main purpose of sidequests is to find out those little gems, i.e. getting anima in FFX reveals a lot about seymours past/motivations etc

I will probs go run around gran pulse a little but the missions don't really appeal to me. I'm not a trophy hunting kinda person, although I was very please with myself that I got the superstar trophey without even trying!