I know people who fish using only one kind of tackle for only one species. I'm not about to criticize them, because they're doing what they enjoy and they're doing it in a way that makes them happy. Personally, though, I don't like to limit my options.
I also like to learn new things, and the best ways I've found to learn more about fishing are to fish for different species and to try different baits, techniques, rods, reels and lines.
A good friend once invited me to go bass fishing. He knew of my reputation as a fly angler, and he knew that I preferred to fish for trout. When I showed up carrying a bait-casting rig, he did a double take.
He did another double take when I fired cast after cast without a single backlash. He did a third double take when I cast a spinnerbait over a sunken log, teased it up to the log and let it fall as soon as it crossed over.
"You've done this before, I take it?" he asked, grinning.
"A time or two," I replied. "Hey, man doth not live by fly rod alone."
The goal of fishing, after all, is to catch fish. The more or bigger fish anglers catch, the more they tend to enjoy the experience.
Perhaps, then, we should all take a lesson from Jeremy Wade and start caring more about catching fish than how we go about doing it.
We'd probably catch more fish, and we'd certainly have more fun.