I could've said that better, what I really meant is that UI is (a) downstream of state, and (b) has a different structure than state. The UI is a tree but state

I could've said that better, what I really meant is that UI is (a) downstream of state, and (b) has a different structure than state. The UI is a tree but state is basically a graph, and it doesn't make sense to couple the two. This is the same position that SolidJS takes, for instance. To respond to your last statement though, I feel the opposite is true. UI's don't exist for their own sake, they only exist to support the application and its behavior.