That is mass production you are talking about. But there are a lot of people who build their own special purpose devices, and all the alpha/beta testing happens with manually soldered hardware, since prepping a machine for just 10 boards is way too expensive. For that reason even in production many of these devices are at least partly manually assembled to save money. We are talking 1000+ devices to make machine production profitable. Many devices don't have that many customers, at least until the next set of hardware is there.