Just cause you never go to a zone doesn't mean it's missing that's like saying Ala Mhigo is missing just cause we can't visit it even though it's referenced countless times and there are NPCs from it and whatnot.

The fact is your making a mountain out of a molehill. There's not content for that zone so it doesn't exist they didn't want to have an awkwardly large stretch of land at the ends of Thanalan and Blackshroud to make them connect so they just instantly traveled you to the entrance/exit of the other. In other words they chose ease of travel over realism games do it all the time(inc. FFXI & FFXIV).