One thing that has not been done yet with FFXIV

[TheMightyMollusk]

I wouldn't call wow's Deepholm exactly a dark depressing slog. And it was underground.

I still wish the Azjol-Nerub underground zone in Wrath of the Lich King had actually happened. The Nerubian architecture we actually see in the two dungeons made from the remains of it was pretty cool.