My thought on the deal is learn to fish in water that is all to your own, and learn to read water.
Fishing in combat zones like some of the "socalled" experts do and getting fish is not really escalating your expertise, other than learning how to play a fish.
Hatchery or not, the ethical old school way where you find the fish is the road to success.
Flossing is a very broad spectrum.
I call it "sight fishing" ,
That ain't no fun to me, but then again I don't fish the "ditch" "reiter" "blue creek" etc.
Learn to fish many different methods, and learn many rivers.
I have never used a 10ft leader for anything.
Other than under a float, with a jig.

I just try and learn new ways to find fish, and be in solitude and enjoy the nature being outside part of the deal....but thats just me....
If you use a 10ft leader, more power to ya!
You will never see me doing it though.

Maybe I don't get the flossing thing, I don't need too
WW