Oh, that’s a good point actually. Since the gnomish/dwarven unity predates the War of Three Hammers!
But then we run into the problem that the gnomish population should be bigger then the mere few % that survived Gnomeregan, especially now that Mechagon has also joined the Kingdom of Khaz Modan.
(Did someone say the Kingdom of Khaz Modan is the greatest kingdom that has graced Azeroth since the Kaldorei Empire, because I will say it if they didn’t!)