Originally Posted by
Mister K
Additionally, which might not be true for all comps but certain PVE items have strong set bonuses which will translate over to 2s/3s comps for S1. Thunderfury was also an extremely strong item (can't comment on Atiesh) and yes while people had it back then, it wasn't as widespread as it is now, all impacting gameplay. People have more time to prepare and god knows when TBC launches.
This is not an evolution of WoW from Vanilla to TBC, merely another version of the same game, there is no progression but it's very own entity.
If you knew TBC was something you would of preferred, why put all the effort in Classic, for the chances of your progress not being carried over?