In a very different sense, cars do use shared parts and communication mechanisms such as canbus to decrease integration difficulty and cost. While I agree tha

In a very different sense, cars do use shared parts and communication mechanisms such as canbus to decrease integration difficulty and cost. While I agree that it is not necessary for parts to connect to each other via standard mechanisms, I think the compatibility trend will increase over time. More and more parts will use standardized interfaces to each other, especially in terms of electronics, just to decrease costs.