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The most important thing here is choice that rewards player agency immediately.
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For example, in Wrath most people never made it to Icecrown, you were already 80! Now you don't have to skip the stuff you think is the coolest - you can do it first.
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With scaling, the zone will always feel challenging, through level 100 to max level. Those little max level areas are gone (such as Ogri'la) and now we can use the whole
world.
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This is a huge win on the amount of content that can be generated at max level.