fishtale wrote:
I could
see where such a leader would help on the use of soft baits. The bait
would likely move more freely

Precisely the opposite. Fluorocarbon is quite stiff as compared to the
braided line.

the line would be less visible to a
fish contemplating a strike.

Fish are incapable of "contemplation"
They don't THINK as we know it. They merely react to stimuli.