That's very close to the thesis of Richard Dawkins' seminal book, the Selfish Gene--we're just machines constructed by genes to replicate them. It's literally true, of course, but we don't often take that perspective; yet many things in biology aren't intuitive unless and until we do.[1]
[1] OTOH, some things in biology become inexplicable when we do take that perspective, such as non-kin altruism. IIRC, Dawkins admits as much in the book. (Contra some subsequent sociopolitical interpretations, Dawkins never used his "selfish gene" model to refute the possibility of non-kin altruism, just that the model in isolation was insufficient to explain non-kin altruism, the existence of which he seemed to take for granted, at least in humans.)