Yes,
It allows Blizzard to release Classic as it was originally intended (part of TBC was supposed to be part of Classic). TBC then would not have happened the way it did. Blood Elves as part of Wotlk Expansion? No introduction of draenei the way it was done. Would Blood Elves have been horde to start with? Or would they have been alliance with the roles of Night Elves and Undead in their initial campaign switched around? Ogres for horde instead? There are so many things they could have done differently, and it would be really cool to see such an alternative wow story develop.