Ark Hotel Construction time lapse building 15 storeys in 2 days

Skyscraper.com reports:  "Six days. That's how long it took to build this level 9 Earthquake-resistant, sound-proofed, thermal-insulated 15-story hotel in Changsha, complete with everything, from the cabling to three-pane windows. The foundations were already built, but it's just impressive.

- I just can't understand why every single building is not pre-made in factories first, for optimal energy, material and time savings, not to talk about a more efficient and cheaper end result and, in the case of the Ark Hotel, only 1% construction waste. "

Take a look at this video.  Absolutly amazing!  Wouldn't you think with all 'our' tools and research, America could do the same?