I would also argue that enabling capacity planning and drawing a boundary around the scope are also valuable by-products. Perfection may be impossible, but Bro

I would also argue that enabling capacity planning and drawing a boundary around the scope are also valuable by-products. Perfection may be impossible, but Brooks' Law being a harsh mistress, and scope creep being a very real thing, having a serious think about how big you intend the project to be to be before you start can make the difference between finishing it in months, and having it turn into a years-long death march project.