With tech, even away from the cities, progression has been fairly fast. Consider Mesathallasa. We have big villages (such as Fibeslay, or the trade empire of Vascogne). Some have even embarked on major construction projects. And they haven't even got agriculture, and unless they learnt fire from some other source they've only had fire for less than a century. I find it best not to think too much about it, though.
Fibeslay is pretty much THE biggest village in Mesathalassa. The Vascogne's influence isn't that big either, remember that when Susa visited the current lead she lived in a glorified hovel. All human villages are divided between stinky fishing harbor villages and small tribes of dudes eating nuts from trees and meat from animals.
The funny thing is that the scale of Galbar appears to be relatively small compared to Earth in terms of territory if, for instance, Vetros controls the entire firewind desert. Local maps are few and far between. It's probably easiest to take it as interpretation rather than accurate measurements.
I think that is just because of player attention. Since we can't cram new cultures everywhere the map feels much smaller. But, I personally always assumed the north-south stretch of Mesathalassa to be almost the same as Chile's.