What's the problem?

The thing is that you certainly won't use all of these abilities in normal play. Honestly, you'd be doing well to use more than,

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say, ten abilities when you were out and about questing, especially once you're done leveling. Now, you might say that actually you play a resto shammy and you don't use all those abilities right now, at all. What's the problem? Well, first up if you don't use them,

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 you should have no issue losing them, right? But maybe you just don't go in for your utility spells. Maybe you're a dedicated set-role healer on a 25-man raid team, and don't even need to interrupt,

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 let alone start throwing grounding totems around and binding elementals.