Ironforge was never sacked. The orcs merely surrounded the city but were unable to breach it or lay a true siege into it because Dwarves are really the best race in the Alliance
I’m not talking attacked, but wiped out. Would’ve been neat if Sargeras would’ve shifted his aim a little bit and stabbed his sword through Thunder Bluff, but we have to wait for something else.
A large number of the elves were killed but the city is still there and still a capital.
Kezan itself isnt even a capital, Undermine is. We dont know the actual fate of Undermine, but given The MOTHERLODE!!! showed Kezan isnt totally destroyed, its safe to assume Undermine isnt either.
Never sacked by orcs, still fully intact and still a capital.
Thunder Bluff was overrun by elementals at the end of Wrath, and later seized in a bloody coup by Magatha Grimtotem after Cairne’s death. The entire Skychaser clan was murdered during that civil war. Finally, during a visit by Ebonhorn, the entire city was trapped in a ‘void haze’ as Old God minions attacked its citizens. The Tauren capital has seen more than its share of catastrophic destruction.