The different line weights match the stiffness or load characteristics of the fly rod and the difference between rod sizes becomes progressively larger as the size goes up because difference in line weights also becomes progressively larger the difference between a 2 and 3 weight line is much smaller than the difference between an 11 and 12 weight. The stiffer rod will help lift a larger trout out of a deep hole assuming your tippet can handle the pressure.
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