Not ignoring it, you are NOT going to sit in S2M 24/7. And basically yes both of them need attention, but don't say silly stuff like Shadow is more valuable than anything that Warlocks bring to the table, it's just not true, simply because Warlocks have 3 specs which ARE giving it plenty of valuable stuff that Spriests simply do not have - Destruction only has plenty of things that are very valuable that Spriests simply don't have.
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I find this very hard to believe.