No machine has evern been 'the most important'. It's a freaking machine. Whatever it does can be replicated by different machines if you pour enough money into it. This delirium of thinking that if you ban !something specific!, China will end up clueless, hapless because it wont be able to do it itself, reeks of base racism as it sounds like the Chinese are not 'smart enough' to develop one freaking machine.
This kind of supremacist delirium is killing the Angloamerican West.