I'm sure those buildings are made like crap and have safety issues.
On the other topic China's wealth comes from exports. They pay their workers crap and no other country can compete with this slave factory wages. If the US ever wakes up and realizes that they should be manufacturing their own crap and puts heavy tariffs on China imports, the China economy will crash. Look at Walmart, Costco and Bj's and the percentage of Chinese goods they sell. The stores would be empty without China. GM is making their car parts in China. Hell even many Gibson guitar models are made in China.
Once a can opener factory in the US realizes they don't have to pay union wages, medical, taxes and rent along with every other expense they go to China to make them. Now they pay pennies on the dollar to have them made in China leaving all the employees involved in the can opener factory unemployed. I know some would say who wants a can opener factory job. The factory employs secretaries, accountants, security guards, janitors, factory workers, truck drivers and pays taxes. These workers pay taxes too. The economy needs low level job as well as mid and high level. The economy can't rise without all three.