[ergothus]

> the game has had incredible longevity

I'm not a WOW player (or really any MMO), but it's always impressed me how willing Blizzard is to throw out all the investment people have made in learning the game system details. Talent trees (or whatever they are called) are rewritten practically each expansion to follow very different rules.

I suppose it has to do with knowing that NOT changing is a guaranteed loss over time, but still, it feels like an unusual attitude.

[HeadsUpHigh]

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.