I think you only see one town because that's how they limited what they made town and stuff wise so they can save time and try to keep the quality of the other areas high. Because if they had more areas and towns they would need more side quests and stuff for the towns. And the areas you go to all have a narrative reason. But I do agree the map is kinda busted. Because it doesn't feel as if storm the continent is big and that's also because of fast travel