Is there a reason why constructing a Lock requires Steel instead of Iron, or even a Common Bar? The current situation pushes the construction of houses to late in the skill progression.
I think it is safe to say that historically people were building houses before they made steel. The game lets you build advanced armors out of common bars.
Maybe all this is rolled up in the larger topic of the availability of Flux. Sorry if I've missed a larger discussion. I searched for topics about Locks but got hits on locking skills.