No wonder our grandparents generation were good with mechanical things. If they were looking at materials like that all the time - I feel like you'd build an intuitive sense of how common household devices work pretty easily if it were so clear and accessible.

In the architectural space it’s common to have design files for everything, especially today.

I looked at Delta’s website and sure enough you can even download CAD models and drawings of their faucets: https://www.deltafaucet.com/bim-library