Yeah you should be able to pick which room you want to do at any time and not be stuck doing it in such a rigid pattern. Maybe someone just wants a main and basement.
In order for me to change the outside/exterior, I need to complete all the rooms. Main, 3 sides, attic, basement, in order for me to have the options to change the outside siding, roof, ect. It's not cool. I wanted to do a main room and have it look abandoned from the outside. Now I have to block off the other rooms if I really want to do that.