Here is my attempt:
F: need for "goodness"
T: need for honesty
I can see where one would say this, but this focuses too much on the positive qualities of both sides. Feelers are not always good and Thinkers are not always honest.
Some of the worst hurts I have recieved in life came from actions of Feelers and some of the most kindness came from Thinkers. To equate "good" with Feeling just doesn't sit well with me for that reason.