Interesting subject which depends on how you look it - eg Fluorocarbon Vs Mono .... Technical benefits Vs a consumable that you are thinking of the cost (in many cases)
I use FC pretty well since it came out ( early 2000s) - there is no doubt in my mind it makes a difference in light line , shallow / clear water & finicky species ...... I wouldn't use anything but FC for my bream , bass , trout fishing (unless fishing topwater - Mono because of the difference in density) ....... The use of FC progressed to my snapper fishing - that is much about confidence than anything tangible .
When it comes to deeper fishing & bigger fish ........ I'm less convinced of the benefits - yeh would have loved back in the day to have had FC on the boat when you have 70-90kg yellow fin tuna at the back of the boat refusing all offerings.
These days we have a good selection of clear monofilament leader material available - * Now leader material is not the same as monofilament line
Leader is often a coextrusion (different polymers or additives used) - Harder & less supple - I used to sell an additive to Aust monofilament that went into their game leader to improve the abrasion resistance . Note : There are monofilament lines that a coex (two layers)
Now having said that - any impoundment barra fishoe worth their salt know the benefits of using this bad boy Barra leader.jpg
Its hard as rock (straight Pa6 nylon) with great abrasion resistance (compared to other leader FC or mono) - cheap as chips & readily available ....... the big plus is it's diameter - thick 55lb is 0.8mm - compare this to 50lb Sunline FC rock @ 0.57mm - that greater surface area means more abrasion resistance & ultimately nothing to do with the breaking strain . The impoundment barra guys have used it for 20 years or more . I do expect more than a few spools have been sold to the odd reef fishoe over the years too
What I've come to realize over the years is that leader is a personal thing .... one of those things that will be argued around a fire for years to come . You either see it as a commodity or as something crucial for your fishing .
Any way you look at it ..... this is a reasonable read
Sport Fishing Leader | Flouro VS Mono | Ocean Blue Fishing
Chris