If it was as easy as just picking a fly that looks close off your hat
more people would flyfish instead of spinfish. Coming close rarely cuts
it on a large wild or holdover trout especially on slow dry fly pools or
tailwater fisheries.

a. Do not attribute this to an extra skill needed as opposed to
laziness.
b. Coming "far" usually works much better (when was the last time you
saw a bug with a red circle around his body).
Frank Reid