Neither can it simulate the important parts of doing the work. I disagree with this. With some effort, you can create a small sandbox app that recreates an exa

Neither can it simulate the important parts of doing the work. I disagree with this. With some effort, you can create a small sandbox app that recreates an exact bug or existing implementation that needs a a feature added to it straight from your day to day work. You can even translate your obscure problem domain into the appropriate analogy.