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We all know that back when hit, and later on expertise (or weapon skills in its original form), were introduced they functioned much like any other stat. It was passive on gear and as you collected more pieces you inevitably ended up with an amount which was suitable for the content you were undergoing.
Then Blizzard changed up how stats worked. On top of the original enchants we had in place, they brought in gems so you could further tailor your gear to provide the stats you wanted. This was intended to make it easier for players to get their desired stats from gear, and was also to help people move away from all having exactly the same items as they did in vanilla with 8 and 9 piece tier sets.
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