Don't forget also that the consequences of crashing a flying vehicle will generally be much more severe than those of crashing a car. Wrecking a car at high speed *sometimes* results in a fatality, but falling out of the sky in one of these would kill you, and anyone under you! Do *you* want the people you see driving around you flying above you? I don't! (And as for training... most people driving have years or decades of experience, but people keep crashing!)
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Don't forget also that the consequences of crashing a flying vehicle will generally be much more severe than those of crashing a car. Wrecking a car at high speed *sometimes* results in a fatality, but falling out of the sky in one of these would kill you, and anyone under you! Do *you* want the people you see driving around you flying above you? I don't! (And as for training... most people driving have years or decades of experience, but people keep crashing!)
And sometimes it's just the opposite! Consider the DOS utility pkunzip. *Five* of seven letters typed with the left index finger! what a pain.