I think that is true when the goal is to get something well understood out quickly. In other cases, it is more important to get things right and continual refa

I think that is true when the goal is to get something well understood out quickly. In other cases, it is more important to get things right and continual refactoring is the fastest way to find an acceptable architecture to a novel problem. In either approach, when speed is of essence, a limited scope helps avoid either producing insurmountable technical debt, or an unterminating research rabbit hole, respectively.