It's all about the right tool for the job.
Fly fishing seems like an intimidating pastime at first. It doesn't have to be. With a few basic skills, you will enjoy many fun and productive hours on the water. Choosing fly tackle can also be confusing and overwhelming. It's not because we want it to be, it's because fly fishers today want choices. They want different price points depending on their budget, but also because today's fly fisher could be chasing anything from a tiny sunfish to a giant sailfish, and be fishing anywhere from a tiny mountain stream in July to a raging steelhead river in December.
The length of your leader depends on water conditions, not on the length of your fly rod.