It's obvious, Fates suck hard. Despite that, it's still worth the small amount of time to do them if they are close by. All those 10 and 15k exp rewards add up in the long term.

I am currently level 58 at level 56/57 main story quests because of this. At this rate I will hit 60 well before the main scenario quests catch up to me. I owe this to opportunistic Fate grinding.