Not by much when it comes to the Warlock's default strength. Like I said, it's the strongest one out of the three.
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If you believe that the classes are imbalanced and one is more powerful than the others (I strongly disagree) and then use that as an argument to justify other classes getting better gear, where do you draw the line? If there is an issue with class balance and one class is more powerful than the others, gear is obviously not the way to address that.