It's not difficult to argue that electronic systems are more efficient and less error-prone than any organic system, be it guard dog or human. In the future milk production may be replaced by machines by artificial synthetic production.

Electronic systems can be more efficient and less error-prone. But they can also be a lot worse, too. Organic systems are adaptive both through learning and selection, so at least in their areas of expertise they are usually still superior to all but the best electronic systems.