There's a lot more to the state of a building than a human interfaces. When the ambient temperature changes, the state of the building changes. When the wind blows, the state of the building changes. When it rains, the state of the building changes. As materials age, the state of the building changes.

We're just so much more familiar with these forces and states that we can reliably model and design for them, and then (as with your comment) not worry about them anymore.

We take it for granted that our buildings won't fall down in a storm. But the knowledge of how to do that had to be developed and standardized at some point.