It’s just as important to figure out how things move together, as it is to figure out how they fit together.
It’s also a lot more difficult. When things aren’t moving correctly, it’s easy to see. My computer doesn’t boot up, my kitchen appliances don’t work, my sewing machine doesn’t sew. These are all things that happen when things don’t move together correctly.
Intended movement isn’t usually shown in user manuals or service manuals either. I suppose in some cases it might be a trade secret. In other cases it might be something difficult to document. Seeming odd or arbitrary troubleshooting in user and service manuals often seems to be focused at getting parts aligned to move the way they’re intended.
Timing in software is an entire other black art.