Yeah, and project management 101 seems to have a good explanation why more iterations are better in this case : you want to be more Agile when the project is of

Yeah, and project management 101 seems to have a good explanation why more iterations are better in this case : you want to be more Agile when the project is of a more experimental nature, and the larger the refactor, the more likely you are to run into one of these "unknowns"...