You do understand that Chinese Companies can easily just hire people from abroad?
You also do know how many companies moved their knowledge to China on purpose right?
The knowledge on how to build things, is learnable even if you don't just 'hack' everything.
And there is a lot of signaling happening, that china has surpassed American and European companies in R&D. CATL for example.
Whatever China did or still does, its a land with 1.4 Billion people vs. 340 Million.
Also we achieved, around the globe, a level of expertise around so many topics, that we do not talk about huge differences. If an engine from china is a few % less efficient than the high techv ersion from germany, but the labor cost is fundamental different, than you just loos.
And the prices are significant different. So significant, that if USA doesn't change, it will not be able to compete.
Even a 104% tarif does not change the competitivness of China in a lot of areas.
All of this is only a problem in capitalism btw. and with the upcoming robot revolution, the 'richness' of manufacturing will never again go to the workers ever. This time is over. We need to figure this out