Originally Posted by s4dfish
You're again failing to remember that spamming SL on a tank creates a healer who isn't healing. Damage to the raid did not drop, is simply spread out a bit, however raid healing drops by the value of 1 shaman, this is not an insignificant effect.
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Even if you assume that you'd need all your GCDs for Spirit Link (which, as the people above, I doubt) it's decreasing the healing need by a lot by making the damage MUCH less spiky - yes, it gets spread to more people, but it's much slower on those people, meaning overhealing can be decreased along with a lowered chance of accidental tank death.