You're right in an economic theory sense. Ask, though: As these changes happen incrementally, to whom does the profit accrue?
Hint: It's not to the truck driver who used to haul the goods.
This is the problem of automation. As we get superbly efficient, it becomes possible to feed the whole world, and administer that process, with a tiny fraction of the population. So: How do we administer giving food to all the people whose labor is not necessary? We've been finding makework for them, for the last half century. Second assistant managers of HR, associate vice president for diversity issues.
We need to find a theory, under which it is not demeaning that people get fed, even though their skills have no net value to society.
This is a bloody hard thing for a libertarian to confront (waves hands)