Yeah, I get it. Although in React's case the whole vDOM diffing thing is self-inflicted - it is only necessary because they insist on the UI being a "pure" func

Yeah, I get it. Although in React's case the whole vDOM diffing thing is self-inflicted - it is only necessary because they insist on the UI being a "pure" function of state. Turns out that the only way to do this with an imperative API is some kind of tree diffing, so that you don't recreate expensive stuff from zero each frame.