Ok, for example, say a person is exactly equal in their T and F preferences and they are a head manager at a company. There comes a day when business is not going well at all, and it would be in the best interest of the company to lay off 100 people...however, those 100 people have been working at the company all their lives and they have no where else to go. I imagine someone who is both equally T & F would have a huge problem with this dilemma. You know what's best for the company, but you also care about the workers and their lives. Someone who is more T might still feel much distress about laying off those people, but rationally knows that if the cuts aren't made everyone will suffer. Someone who is more F would be much more distressed about the harm done to the layed off employees.
I dunno if that explains my thoughts a little more, but I suppose I was thinking more in terms of head vs. heart decisions rather than in specific functions. And like Jen mentioned, it's likely that younger people would experience this conflict more often than the matured adults.