"But there is no scenario in which one is necessary"
Yup.
And if I get another car, I doubt if necessary will enter into my decision making process. If I am honest, another car is the opposite of necessary, it is actually madness. I am telling myself this, more than I am telling you, so I know exactly what I am getting into. So, how much madness do I want, and how much madness can I afford?
And, I truly appreciate all the info. It is magnificent.