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Unitized body construction is standard because you can travel a longer distance for less money than with the alternative body-on-frame design. https://en.wikipedia.org/wiki/Vehicle_frame#Unibody

Electric cars are often compared to cell phones. Why have cell phones with replaceable batteries essentially died out in the marketplace? I have the same question about modular phones: https://www.cnet.com/news/google-lg-lenovo-modular-phones/

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Unitized bodies may be more economical when comparing one vehicle to another, but this design allows for multiple cars on a single platform. So a family may have 4 vehicle types and two “skateboards.” So, for an apples to apples comparison, I think you’d have to compare this setup to _four_ unibody vehicles.

> a family may have 4 vehicle types and two “skateboards.”

This seems fairly unlikely. Where would they keep the other two bodies? How would they switch over?

A family of 4 car models. Not a family of humans owning 4 vehicles.

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