Strength is fairly pointless unless you're getting encumbered. It has no influence on defensive mechanics or aggro generation. It increases your DPS by a little bit, but due to the way aggro works, that extra damage is applied after aggro is calculated. Basically, when you swing your weapon, you generate an amount of aggro determined by the raw damage value of your weapon - doesn't even matter if you hit or miss. All that matters is the weapon ratio, your haste, and any procs your weapons might have.
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