You are so right in your reply. But some people think that "scope creeping" is a bad thing... it isn't!!! That's EXACTLY how big projects are made: they start small and depending on partial results and feedback they "creep" into larger things. Even for games. Nobody is capable of pre-defining every single aspect of a project in advance. It is impossible. You start with something simple.... then you make it better. Ask the makers of Microsoft / Apple / Google / Facebook etc...