I believe that due to the cooldown on the shaman spells, spamming a /castrandom macro was able to provide considerable DPS. If a spell wasn't available, you'd just fire off the next one. No worries about timing or sequences. That may be why Blizzard changed it, it made mindless button spamming effective enough to make castrandom macros attractive.
But before the change, it made for a very efficient DPS macro. Hit the button as fast as you can and your shaman would crank out very good DPS.
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