Obviously you can't confirm this. But as a fan, I'll go with the abilities:
Loot Master: You may take loot 2 (all might be overpowered) items, and if you don't keep one, you sell it for 20 gold. (less than the alchemist who gets 30 when switching equip)
Master Tailor: You have learned how to take abilities from one item and incorporate them into another. The transferred ability removes the original. (You can only transfer abilities that you have, not ones you might gain from a new item)
Not sure if that's too overpowered. But from your description, that's what comes to mind. And yes, that is no longer a filler career if it's anything like that.