Sadly this comes down to such a trivial thing as perception.
The game DOES have adventuring and variance throughout landscape.
<non sequitur>
Let me ask you this, Have you ever taken time to really REALLY look at the game's overworld maps?
If you did you would see that there infact exists MANY other zones AND cities, and coincidentally they are liken to FFXI's environment: There's a Ice place like Xarcabard, there's a tropical jungle with a Volcano like Khazam, there's a beach/peninsula type place like Mhaura. That's only to name a few.
My point is: This is a common thing amongst players in the game. FEW of them know the Lore and hidden secrets of Eorzea because they haven't taken the time to even READ the ingame tomes OR even external maps the game shipped with!
So naturally, you say to yourselves: Well it's not there on a plate with big blinking lights pointing it out for me so therefore it doesn't exist.
<non sequitur>
In closing: There is A LOT more to this game than most people know. All it requires is EXPLORING the Guilds and landscape to figure this out.
<non sequitur>
Good Luck adventuring in Eorzea
