According to this https://www.ign.com/articles/the-bur...al-wow-classic
"several bosses were bugfixed or nerfed in Burning Crusade, but players might be interested in trying their hand at fights in their far more challenging forms. For instance, Lady Vashj -- the final encounter in Serpentshrine Cavern -- was incredibly difficult to kill when she was first released, before a nerf made her more reasonable. But Blizzard will let her launch in her pre-nerf form so guilds that want a challenge can try their hand at that, before eventually bringing the nerf into effect."
Sounds good since players are way better than we were. Going to be a pushover still but it's a right move.