Same thing for fly fishing. Having the proper tools makes for a more enjoyable and productive day. No other item in your setup aides in the delivery of your fly as the leader you use.
While doing the fly fishing trade show circuit, we often hear from fly fishers that want one leader to do everything. Sure anyone can throw on any fly they decide to their leader and catch fish, (once in a while) but is that the best system. Think of tying a large weighted wolley bugger on the same leader that you deliver a small size 20 dry fly to rising trout...? Even if you are a great caster, this outcome would not be pretty.
Because 90% of new fly line have welded loops, changing leaders takes less than two minutes. That two minutes will make large improvements to the delivery of your fly to feeding fish.
Most of my fishing is with an ultimate dry fly leader, a dry fly and or a dry fly / dropper setup. On a typical day of fishing, I will throw small dry flies as well as large heavy streamers with the same fly line. This means a quick leader change occurs often. If while tossing streamers against the bank, I see a small hatch materialize, I quickly change my setup to deliver dry flies to feeding fish. This system not only increases catch rates, but also makes the day on the water much more enjoyable.
A couple different style leaders in your arsenal is all you need.
