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It's a trend-setting attitude. Relearning skill builds is easy and relatively fun because you already have the skill points/levels and all you do is just allocate them again( provided the new ones are balanced and fun). What blizzard is doing is basically reseting the entire progress of every player in the game every expansion. You might spend 2 years building up your end-game gear and then an expansion comes and the common drops from one level higher are more powerful than the highest drops from the previous one.