Oyrta/Sulek are right on a major trade route from China and theoretically that could provide enough income to turn those locations into cities - which is a key factor. So, yes they will ultimately have the ability. By contrast, Tuat/Kirtan are in the middle of nowhere and whatever trade came through from the south, it would never have been enough for them to become major cities in this time period.
Some people might be surprised, but the same rule applies to those regions in Germany/Baltics which are far from the historical Roman Empire border and didn't develop cities until the mid-middle ages or even later. Developing a high population industrial setup in this area during our time frame is every bit as impossible as building a massive city in the middle of the steppe. If anything we erred on the side of "maybe, perhaps, if all went perfectly" in a few locations. Frankly it just gives a much more historic feel to the game when you don't have huge cities popping up in ludicrous locations.
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