i have heard the same thing from others and i absolutely get the feeling. but it does do something with it in the end

honestly its just a matter of the game itself being so good and that they manufactured this script for what is legitimately a videogamey post game with all the post game video gamey challenges that it feels like an 'Act 3'. Personally i was so happy to have them back, i really didn't care

i don't wanna spoil it but if you make it to the end, they put a decent little bow on it in a way that only a DQ game can.