I'm a die-hard braid guy, but I have seen the benefit of using a FC leader. If you're like me.............after using braid for so long, you will HATE FC as main line. Even the best stuff, IMHO, handles "different" than braid, and I just never liked it as main line. I tie my leaders to the braid with the Alberto knot, it's stupid easy to tie, and has been bomb proof.
Here's the when/why I use a leader:
#1 Drop shotting...............100% of the time I use a leader..........I do not like how limp braid is for this.
#2 Fishing docks, or other super snaggy cover............if I am hung bad, I need the ability to break off so I don't have to in and get on top of what I am fishing, when using straight 30-50 lb braid, you'll pull the boat over to what your fishing before you break off............plus the added abrasion resistance of FC leaders is a plus around the wood/docks/rocks that are often coated with razor sharp zebra mussels around here. Since I bounce back and forth from fishing grass, to fishing docks all the time, most of my jig and plastic rods will have FC leaders on them 100% of the time. It's totally un-needed for fishing grass.........but I don't want to have several rods rigged up with the same stuff when bouncing around, so they all get leaders.
#3 Throwing reaction baits (other than top water) ..........My home waters are loaded with pike and other toothy critters.......their teeth cut braid like a hot knife in butter, with a FC leader I stand a better chance of getting my baits back, and I just don't get the bites or the performance out of my baits I want with steel leaders, so FC is my only choice.
This is what I tie straight to the braid:
#1 Frogging/top water................no exceptions, 100% of the time tied direct to braid.
#2 Punching grass mats .............that is if I am going to be doing that exclusively and NOT fishing docks/wood/etc, which happens just a few times a year, because even on a day when I am punching grass, I'll always still hit some docks, and/or deeper less thick off shore grass beds.