Our expectations about cars have definitely changed over time. I don't think it's even legal to sell new cars without seatbelts, something that did not exist when cars started. Even low end cars in the US have added features compared to low end cars of the past, such as power windows, power steering, power mirrors, and so on.
It's true that adding features is slower in cars, but that is because cars are partially hardware. It takes much longer to add features to hardware, because making copies is not free. But that does not mean they are unchanged.
Our expectations about cars have definitely changed over time. I don't think it's even legal to sell new cars without seatbelts, something that did not exist when cars started. Even low end cars in the US have added features compared to low end cars of the past, such as power windows, power steering, power mirrors, and so on.
It's true that adding features is slower in cars, but that is because cars are partially hardware. It takes much longer to add features to hardware, because making copies is not free. But that does not mean they are unchanged.