There is absolutely nothing wrong with FFXIV airships.
They were designed the way they are to be in accordance with the lore and general gameworld design. If you stop respecting lore, then you get CON=WHM (lol fail). And then the game starts to become inconsistent and gimmicky.
They look fine to me:
http://www.ffxivcore.com/index.php?a...attach_id=5233
http://www.ffxivcore.com/index.php?a...attach_id=5232
FFXIV city states only just began airship travel, but their naval ships are much more sophisticated. If they had fleets of huge airships, garlean empire wouldn't seem like such a great threat to the game, since huge overpowering airships are their specialty and intimidation-factor.