If you want to play that game, you need to offer a fair comparison against the cost of "operating" the equivalent human being(s), measured in caloric input, waste output, etc.
Minimising the cost of “operating” humans means getting rid of humans. When human beings are not slaves and operate in a fair system, humans doing things is part humans living. Believe it or not, they may actually enjoy doing things; taking away the ability to do things we enjoy, and especially for compensation, is in fact harmful.
Historically, it leads to more humans—not fewer—and they get to do something else. Whether the new things they get to do are better is a matter of some debate.
Historically, it never happened that “get to do something else” would mean “get to do something no one needs and therefore no one will pay you for”. It would be harmful not only for humans flourishing but also for their basic survival.
