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Why would you want a vehicle that only covered 95% of your use cases?

It's like condoms - better to have it and not need it than need it and not have it.

It certainly makes sense on a personal level but when one multiplies this thought process by a given population there starts to be a compounded issue of excess material going into the construction of the vehicles, excess fuel being used to move them, and excess parking space used to store them, to name a few.

Redunancy and efficiency are common tradeoffs we are constantly trying to balance. It's only a question of how important the effects of downsides are.

Sometimes someone dies as an immediate result, and for some it means waiting for another 5 minutes.

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