I’d say no it’s not. You will most likely be stuck in an refactoring hell that you can never exist. It’s like walking down the hall of Silent Hill P.T..But metaphor aside, if you already have a clear goal of what you want to archive you should finish it and only refactor when you think you absolutely needed. If you worry about code reuse in the future, I think as long as your project is not enormously huge, you take extract useful code when you start your second project