Iterative Delivery with Rockets!

SpaceX are taking Iterative Delivery to a new level using full scale rockets that they build, test and fly to destruction. Their accelerated learning process has been nothing short of amazing and shows what can be achieved applying modern techniques to literally rocket science. If this can be applied to flying and potentially colonising Mars, what else can this approach be used for?
Acknowledgment to the following Amazing Channels for content :
* Nasa Space Flight / @nasaspaceflight
* Everyday Astronaut / @everydayastronaut
* SpaceXvision / @spacexvision
* SpaceX / spacexchannel
* Music : Eine Kleine Nachtmusik (by Mozart) , KZbin Audio Library licence
0:18 Starhopper
0:29 SN2
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0:48 SN4
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1:11 SN6
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2:52 Future