Don't touch my Miner!:smile51:
I absolutely agree that the Dungeon should not be limited.
After all, it's not what's on the outside that matters, but what's inside: Treasuries, Dragon Utopias (tasty ones), Consulates, Hives, Pandoras, artifacts, Secondary sites, Money, Resources..., etc. and so forth.
These are far more decisive than the Castle types.