I began fly fishing in the early '70's at Bennett Spring State Park, MO. (12 miles from my hometown). That would be Midwest.
My preferred method of fly fishing is to cast dries to rising trout. Unfortunately, there is not always a hatch occurring, and most of a trout's diet comes from sub-surface food sources. Thus, the fly fisher needs to be adept at both methods....three actually....dries, soft hackles/wets, and nymphs.
Some of the most accomplished anglers I have known fish nymphs with no indicator.......
Just my own experiences.