There's no piece of gear quite like a weapon.
At today's World of Warcraft Q&A panel, a player asked if we'll ever be able to transmog our weapons into legendary weapons such as Val'anyr, Thori'dal, and the like.
Well that was a little anti-climatic -- two world quests in Darkshore and my Kingslayers have officially been replaced.
Just because I can, I've been going back and grabbing the legendary weapons I didn't have before in WoW.
Legion's artifact weapons have placed more emphasis than ever before on the tools we do battle with.