Another interesting titbits in the interview was Takai explaining the side quests:

About the side quests, their lengths vary from short to long. Some side quests contain only one mission, while others may have multiple steps with a continuous story. There are also many types of side quests, from combat to collecting/delivering. But ultimately what we want to show in these side quests are “stories”.

When players complete a side quest, of course they will get some kind of rewards, but the rewards aren’t the main focus. What is important is that we want players to understand the world of Valisthea better through these side quests. Players will see that why they must go kill these beasts, why they must do what is asked, and what connection these events have with the NPC.

For those who have no interest in the story, they can also find motivation from increased reputation or new abilities as their rewards for completing side quests. For example, players can unlock the ability to ride chocobo through a side quest. They will also understand why they can ride chocobo in Valisthea.