This might be a cynical way of looking at it, but my dad always used to point out that some things are just there on cars because they need to have accessories. Car makers need to add things on one car and not add them on others so people have a choice. They can choose to pay more for this car because it has wipers on the side mirrors, or demisters on the radio screen, or your choice of one, or <i>two</i> cup holders, while other car doesn't have that stuff.
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