Please let us have personal Airships and Submarines in non-FC houses.

All of the content involved in Airships/Submarines are not very accessible, or fun.
All of the work involved is commonly done by one or two people in the FC, and the rewards are reaped for those individuals with occasional handouts of random things.
The content is not set up to reward enough items for an FC to share. FC Crafting requiring 4 people is a chore, and does not actually encourage people to tackle the content together.

I think it makes far more sense to, instead, allow individuals to do this content in their own houses. Maybe allow less total airships than an FC?
If obtaining housing becomes more doable for the average player with new housing wards, and these systems are changed to allow individuals to participate, I think the content will be revived slightly and you could possibly expand more.