I have built a Qt app using this approach. I created a vdom for Qt to allow for the view to be a pure function of state. However, the app also has some extensive animation, and it runs on a slow embedded processor. I needed an escape hatch to not recompute the entire view on every animation frame on some screens. I think using something like MobX computed expressions could provide the necessary performance to avoid needing the escape hatch. However, the code base is now large and dynamically typed and extensive change is now hard. In general this approach involves recomputing the entire UI and diffing against the previous UI on every state change or maybe every 33ms. If the above takes too long, then it’s a problem.