This!
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Cost of iteration is much higher.
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1st there is the difficulty of flying on top of a controled explosion. Then there is the fact that although the concept has been around for long, there have been far less test-flight hours for rockets than planes.
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I think the failure mode is much more bimodal and dramatic.
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Rockets are highly energetic by their very nature, and every smallest mistake causes an explosion or a comparable effect. So while we do know how to make them reliably, developing a rocket is bound to be quite spectacular regardless.
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Isn’t your background aerospace?
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We are still creatures of mass - we understand pressure (time by space) better than gravity (space by time.)
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