You do understand that THF, if implemented, would never be given skills or traits that would give them a monetary advantage?

Even beyond that, THF is a very weak job in Final Fantasy. The Tactic's series gave them the ability to steal everything but a targets underclothes to grant them anything like a full skill suite. Of the 6 (Edge, Locke, Yuffie, Zidane, Rikku, and Vaan) characters that were had Steal baseline within the core series, 2 of them Edge and Yuffie were ninja's anyway. 2 more Zidane and Vaan were closer to being a Warrior with steal then pure Thief. Leaving us with 1 pure thief (Locke).