>>1238773a few reasons. the big one is it's elasticity. it acts as an extra shock absorber when a fish shakes its's head, which is important when you have to go small (#16 and under) or are using light line. 2 pound test that can stretch and reform to it's self is going to be inherently stronger than 2 pound test that has 0 stretch, because to break the stretchy 2 pound test it has to be pulled a lot farther by the breaking force before it breaks. basically, it's the difference between a sharp snap and a steady pull, a 2 pound sharp snap is a lot easier than a long steady pull.
secondly, i see it floating as a benefit. if you're doing a dead drift and your line sinks, youre more likely to get tangled or damaged line as compared to your line just sitting neatly on the surface., and if you're doing a floating presentation, all the more.
and thirdly: the trout can probably already see your line. my ex fishing guide buddy tells me regularly that fish can already see 4 pound test flourocarbon in clear water, and has shown me big brown trout he got while fishing for muskie (they blatantly ignored the steel leader and tried to eat it anyways)
and lastly: flourocarbon is brittle. it doesn't tie knots quite as nicely, in my opinion, because it is brittle. granted that probably isn't an ideal term, but it doesn't like to be tied in a knot, you have to take more time tying your knots and make sure they seat properly, where mono is more forgiving of a knot with a few too many wraps or that wasn't lubricated fully, or not seated exactly perfectly.
my bottom line is: i might get one or two less takes over the course of the day, but i'm more likely to land the ones i get and im more likely to release them in good health because i didn't have to play them to death to get them in