Voadam
Legend
Do you have any examples? I didn't notice any in my 1e Campaign Setting PDF or the FR1 Waterdeep PDF.Ed Greenwood has put a weird amount of thought into trade routes, they go back to his home game and were in 1E products, much more detailed than Greyhawk was on that front.
I was particularly struck by this size comparison map in the 1e grey box:The Sword Coast is pretty big (the Packfic coast of North America big), and the isolated city states that pepper it are pretty ideal D&F home bases, so they do get a lot of the attention.