Re: The US is important, but not important enough to be able to destroy China's tech industry.
The US has slowly - but inevitably - followed the sugar crumbs China has been laying for the past few decades, and grown fat and moribund as a result. Now it's trying to go on a diet, but those cookies are just too good.
And given how much US Dollar debt the Chinese are holding, it's probably not a great idea to push them into a corner. There would only be one winner in that case.