"Give my Massively Multiplayer Online Role Playing Game more single player features." What's wrong with that sentence.

If you want an airship, make a one person FC and get one. The point of the Airship initially was for Diadem excursions which you could do with a party of, y'know, other players in your FC. It's why Hard mode is locked behind it. You can also queue for the Diadem without an Airship. It's an FC feature, not a housing feature.