The Elvaan's lost to Tarutaru warlords in the past, and had to band together and get over themselves to retake northern Quon. They then lost when trying to bear down on southern Quon.
The Tarutaru then got mogged by birdmen with hollow bones, and had to rely on sexy cat women mercenaries from across the ocean.
The Galkans were overwhelmed by entities that out breed everybody else. Deeply spiritual reincarnaters with an intricate and storied past were pushed out of their home by literal bugmen. No other race could have stood against them as long, and all other races are fortunate that the Antica don't care to move beyond Kuzotz. (A salient point in WoTG quests when the beastmen and unrestful folk sought to communicate with the Antica by obtaining their Xhifut speech organ)
Humes took in and more or less enslaved the remaining Galka for a time, but eventually their unstable union has made the best of all nations. Minds of innovation from the Humes, with the might of the Galka, each tempering the other into the sharpest of tools.
Compared to the arrogant Elvaan who have a corrupt spiritual leader, and no innovative minds...
Compared to the miserly mages and the taken for granted mercenaries that prevented them from being wiped out at all...
Bastok is practically a utopia. Hewn into the hard rock coastline of southern Quon, its bay the only "easy" entry point... It doubles as a nature bound fortress.
It was even able to expand and drive the rise of Jeuno, which only broke away due to the Zilart and their Armathrwn Society. That's right, the setting's literal direct god descendants were the only ones who could shrug off Bastokan influence in any meaningful capacity.
Nynja is just mad that he doesn't have the clarity of mind and soul to embrace Bastok, Galkas, and true blue Humes!