As AK said, you are correct overall however the same can be said for any type of fishing. I have a lovely little Shimano spinning reel on an Ugly Stick with 5 Lb test which is great for the same fish I go after with my 3wt flyrod but I don't think it would work for a 40L Lb+ king salmon.Herein lies the rub with Fly fishing..... There is often a need for more than 1 rod if you fish different types of waters.
Example: I am fairly sure @alaskanpiper did not use the same rod for that Rainbow as he used to catch that Salmon.... The trout looks pretty big but a 5wt or 6wt would tackle that baby quite nicely whereas that salmon was caught on an 8+wt. And with different weight rods come different weight reels, lines, leaders, and tippets.... Well you get the idea..
PLEASE correct me if I am wrong.![]()
I like to think of it as working within a (large) margin of error. On the plus side, you can get away with running lighter weight line on a heavier weight fly rod if need be, within 1-2 weights. Just buy a second spool for your reel.













