Exactly. This is like handing someone a published API and asking why they can't just compile and run it. Patents and service manuals are most of what you need

Exactly. This is like handing someone a published API and asking why they can't just compile and run it. Patents and service manuals are most of what you need to start reinventing the wheel. They're what you hand your R&D staff as you start reverse-engineering something, learning along the way all the little tricks that make it harder than it looks. They're not what you hand your machine shop and start producing.