The list of pros and cons is meant to be written by Lucy, and therefore, kind of negative. She's meant to be the one in the story to try to motivate Annie into being normal.
That depends on if you could build one that worked perfectly in one shot. It might sort of work, and you'd spend many attempts to make one that worked as well as a person.
Yeah but they were stuck indoors though. They had time. Plus the robot would be able out last their time at home. So when they get to leave it can still keep things clean.
Not like Annie has that much of a choice in the matter.