Of the profitable traders I know, 80% have no more than 2 setups.
Given the time to define, test, and gain skill in using just one setup, I can understand why. See my list of 12 frequent execution errors I make for instance. Luckily you don't need to be perfect in this game
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For example, 1 setup may come in 20 different disguises.
An oak leaf may be an oak leaf, but try and find 2 exactly the same.
However it helps me to understand why the setup works, what market forces cause the setup to occur. Market manipulation illustrated through price and volume for example.
DbPhoenix's crisp and exacting definitions help too,
Porks.