20gbps passive USB-c cables were often wired by hand. Machines with the required dexterity to line up the connector used to be too expensive and AFAIK some cables are still made by hand today
Some of their tools are definitely interesting to poke at, but many are locked to internal Apple use by requiring resources only available on their internal VPN. Some more recent samples are available here: https://archive.org/details/apple-home-diagnostic-pkg
We’ve gained a lot in the intervening ~30 years but lost a little bit too.