it starts with 1 piece but they will keep asking for more . if you get a small taste of something you will always be craving for more. blue mage could have been an awesome way to expiriment with party compositions, raid fights and much more. having to see which abilities are more usefull in which fight.
as mentioned before most things on the duty finder don't require one bit of human interaction, you don't have to talk or discuss . You just have to walk the pathway and kill things in your way. this game already has solo content it's just disguised as the duty roulette