Humans can be painfully slow. That's why we use them.
Unlike most cars, the Audi R8 in not built on a production line. It's built in small numbers in a high-tech car crafting facility. Tasks that are usually executed by robots are meticulously executed by hand. It's a lengthy process, but what it loses in time, it gains in craftmanship.
The new Audi R8. The slowest car we've ever built.