That's not the fault of Duty Support, though. They made Duty Support in ARR make perfect sense, as you watched your companions grow through the levels and gain confidence in themselves. Or you have that moment in Elpis when the dungeon comes up and you realize just who exactly there is available to come with you because the story has set it all up properly.

The issue in Dawntrail was just a lack of creativity and just throwing the Scions in because classes were needed for dungeons. It was as absurd as Lyse joking about finding 7 friends who just happened to be on a fishing trip nearby to go help you battle Susano. They need to set the stage in the story why certain NPCs would be available and that's what they failed to do in Dawntrail.