You're not wrong, androids do have certain responsibilities. Some are gardeners, some look after children, others were created with the purpose of military work. It's not quite that way now, but you aren't off the mark in thinking that way.

( connor briefly thinks to all the androids he's known and spoken to in the few months of his life. some seem to be fine with branching out and finding new purpose whilst some felt lost, directionless in a larger world.

so, this human vanessa ives has never met an android it seems. vanessa can't be forgiven for thinking he's human, the only thing that really gives it away is the flickering LED at his right temple.)

We were created to look as human as possible. Does it bother you?