Yep! Manufacturing is the running of the software, either via testing or via deployment. That’s when you’ll find bugs or design defects. Operational errors (misconfigurations, under allocation of resources) are not related to the design of the software itself.

Splitting coding and design is a bad idea. It’s like asking engineers not to draw and measure.

I'd argue it's more malleable than a skyscraper.

How rapidly has business software changed since COVID? Yet how many skyscrapers remain partially unoccupied in big cities like London, because of the recent arrival of widespread hybrid working?

The buildings are structurally unchanged and haven't been demolished to make way for buildings that better support hybrid working. Sure office fit outs are more oriented towards smaller simultaneous attendance with more hot desking. Also a new industry boom around team building socials has arrived. Virtual skeet shooting or golf, for example.

On the whole, engineered cities are unchanged, their ancient and rigid specifications lacking the foresight to include the requirements that accommodate hybrid working. Software meanwhile has adapted and as the OP says, evolved.

With LLMs it's becoming very malleable.