Building Tall building isn't Rocket Science, but building them fast, high quality ( comparatively speaking ) and cheap has not been done yet. And one year to build space enough for thousands of people is not my definition of fast. At least building "On Site".
Burj Khalifa does not have a severage system. Trucks are used to take the human waste away every single day from burj khalifa.
I figure the problem is basically politics. Liberal democracies typically do planning by asking 'stakeholders' (e.g. business owners, home owners, etc) what they think about proposals. Since you're asking the stakeholders in an asset class whether or not you should build more of their asset, usually nearby, the answer is usually a lawsuit.
From what I gather, a industrial-scale air-conditioning unit company basically broke the space open, since they were essentially doing large scale prefab construction already.
Just think about it from first principles. You can build large structures out of prefabricated parts, and if you design the parts sufficiently well, it's possible to fit them together fast. The problems are stuff like weight (transport costs start to dominate), volume (if there's not enough demand for skyscrapers, you don't want to be sitting on a skyscraper factory), etc.
In East China, they have a lot of structural advantages: a huge, hugely dense population, a government that loves big construction projects, a massive housing market, a great deal of experience in doing civic infrastructure fast, etc.
https://inhabitat.com/the-incredible-story-of-how-the-burj-k...
Building tall buildings is not a rocket science. Look at Burj Khalifa‘s construction: clever designed crane, lots of rebar and extremely powerful concrete pumps. And it’s really fast. One year to build enough space for thousands of people.