I kind of agree; flourocarbon lines are temperamental and the knot strength sucks. Why use it as a mainline? The only time I use it is in September when the water is soooo low and clear and the fish have been there for a while and have seen everything. I also only use it with my fly rod which is a lot more forgiving on line.

One more thing, the same thing that makes the line nearly invisible, also doesn't allow it to breakdown with sunlight, so if you lose large pieces on the bottom its not going anywhere until it washes out with a high water. Another reason to stick to leaders.