The steel positioning of Colossus City, in the future, will primarily be for self-use, with a small portion being used to make equipment for sale to profit. This ultra-modern existence, from iron ore to steel or equipment, has less impact on the local economy than a common iron mine like Blackwell.
This is because the work points that originally required a large amount of labor are gone.
In the end, it only developed into a lonely city with a lot of wealth, which is the real reason for the downfall of this city: it lacks a mass foundation.
This city, which only requires ten thousand or so Dwarves to fully operate, could have supported millions of people if it had been replaced with ordinary production methods.
Of course, this also has something to do with those Dwarves not being good at using the advantages they hold. This is best proven by their choice to use surplus steel to make support columns.
