This was born s a Reddit conversation that gathered a bit of traction and I wanted to throw the idea out here and see if it gathered any attention. I'm also not entirely sure this is in the right place, and I apologize if it isn't.
Classes are, more or less, seen as the tutorial for how a job is played, and once the soul crystal is obtained the class is discarded. And when that happens, the guild you worked for for the first thirty levels is basically forgotten. What we came up with in this discussion was another kind of daily quest, not unlike Beast Tribe dailies or GC supply and provisioning missions.