I would say that plans sufficiently specific to be done by any supplier and ability to switch supplier would be equivalent to final code and the final step shou

I would say that plans sufficiently specific to be done by any supplier and ability to switch supplier would be equivalent to final code and the final step should be done by using appropriate frameworks instead of human contractors. Any repetetive software process with precise specification should be automated with better tools or other higher level abstractions. One reason it's not done more for physical engineering is that the robots or machines would be impractically complicated or expensive or other physical limitations. But even then manaual machining is increasingly getting replaced by CNCs and houses built from bigger prefabricated components. You might choose not having a house made from prefabricated blocks due to aesthetic reasons but in software hardly anyone except small fraction of programmers will complain about electron or too many levels of abstraction under the hood.