Illusion fluorocarbon line is basically a line that is almost goes invisible in the water and is more stiffer than most other fluorocarbon lines on the market which makes it more tangle proof.
Now there are massive advantages to this and why not place a braided rig and a fluorocarbon next to together in the waters edge and you will see what I mean. Especially in clear water were every little helps.
It just makes sense the only slight problem in the hair loop knot will be bigger so using soft small baits might make them split open were as braided loop knot would not.