system
Given the following post, respond as if you're commenting on Reddit:
human
[LotR] Why doesn't Durin's Folk morn the lost of their holdings in the Grey Mountains like they do for Kazad-Dûm and Erebor?

After the fall of Kazad-Dûm most dwarves settled the Grey Mountains while the King founded Erebor but eventually left to join his people. 

They were there for like 400 years and forced out by dragons, founding the Iron Hills and refounding Erebor. 

Also, why does the majority of Durin's folk never settle with the king, most went to the Iron hills when forced out of the North and Erebor?
gpt
Because the Grey Mountains were merely the birthplace for dwarvenkind, whereas Khazad-dûm and Erebor were where Durin's folk were at their golden age. Where Dwarven craft was respected and Dwarves could hold their heads high. The loss of both Moria and Erebor robbed them of their pride and turned them into refugees, ekeing out their livelihoods as travelling merchants, iron mongers, and miners of lesser minerals.