[wholesomepotato]

Even as a non civil engineer I can understand floor plans and alikes and find then immediately useful. Even as a professional SWE these example diagrams don't seem useful or informative enough to justify bothering with them.

Code is too multidimensional to be approximated with 2d drawings. It just doesn't work.

What could work are more conventional architectural code patterns. Things like structured concurrency, but also for higher level. Maybe.

[ozim]

Mostly because software architecture diagrams need a lot of context or have to be in specific context and quite tight scope.

Floor plan has really fixed context and very limited scope. Like I don't have to explain windows ... but in software most of the time you actually have to explain "window" because every "window" or element will be different, you cannot just say this is window and copy it 20x.