And note also that all the software that is needed to engineer those things is also not allowed to be sold to China, so that is also another thing they have to

And note also that all the software that is needed to engineer those things is also not allowed to be sold to China, so that is also another thing they have to replicate. And by the time you catch up on the decades of R&D and trade secrets needed to catch up with where the software is at now, everything has evolved even further ahead. Keeping pace with semiconductor technology is a never ending treadmill of constant innovation. Source: my company is one of those not allowed to sell this type of software to China