The problem of fort types

[thejeff]

But the point is, it really doesn't matter. 95% of the benefit of the fort is being able to recruit mages. Then the one turn protection. Admin and resources come a long way later.
That's why having cheap, quick lousy forts is an advantage over having slow expensive good forts.

That's why being able to build better forts in your special terrain is actually a disadvantage.