High-level Shamans, especially those who have Torpor, aren't limited by their hit points so much as they're limited by TIME. You can only cast so many spells so quickly. Canni3 gives you more mana more quickly, so it gets used; the loss of conversion efficiency doesn't particularly matter.
Even prior to level 60--hence lacking Torpor--giving up a modest amount of efficiency in return for pressing the blasted cannibalize hotkey less often tends to feel like a pretty good trade.
Danth
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