Was talking to a pro about it one day. He uses fluorocarbon because his line sponsor wants him to. But he told me that in his opinion he did not feel that it is necessary in most of our Texas lakes because of the water color.
I would agree with this mostly. Fluorocarbon has it's issues. It cost a LOT more than mono. It is stiffer in cold weather, it is less forgiving once kinked, it is harder to cinch down when tying a knot, etc. But with all its disadvantages, I still feel the benefits outweigh the issues.
It provides better feel of my bait and helps me feel the bite better at the end of a long cast. It is just another tool in our arsenal of fishing tools. If you feel it helps you get more bites that translates into more fish in the box, then use it. If you've had a bad experience with it, don't.
I caught a zillion fish back in the 70's & 80's on fluorescent blue Stren, brown Maxima, and Trilene Big Game. I'm still waiting on the scientists to perfect transparent aluminum so we can have 100# test with zero visibility and 10# diameter!