I think engineering in other fields works with blueprints, because there are so many clear-cut expectations/requirements. No matter how fancy the design, the over-all purpose of a building is to shield one area (the "inside") from another (the "outside"). Doors and windows open and close, optionally locks. Heating and cooling must be scaled the to size of the area covered.. etc.etc.

Designing a building is much more akin to configuring a server (which anyone here is perfectly comfortable doing by blueprint) than developing an application.

The level of detail usually required in a software-blueprint would amount to including the placement of pencils on every desk in the building-blueprint.