If you're building in China, your IP isn't protected. You also incur travel costs, long transit times, quality issues that increase product development time, Chinese New Year shut down (for weeks), etc. and the wage gap between the US & China is closing. A lot of 'leading' companies do not fully understand the real cost of offshoring. Search 'Reshoring Initiative TCO' and use the total cost of ownership calculator. Cost is not the only reason, product development is also a factor. There's a reason why Toyota moves to local markets. It's the same reason many Chinese companies move to the US.