The point wasn't to insinuate every part is critical but that there were so many parts from different fields of science and engineering that go into integrating such complicated machinery. The Americans are still in the initial stages of grief and are currently muddying through the current stages...
Banning China students from STEM studies is only the beginning of this tantrum. I wouldn't be surprised to see outright racial suppression starting even while in parallel with hypocritical American calls for anti-racism. In this sort of toxic environment, can China overcome it? This is a question I am sure "anti-China" think tanks pondered and came to the conclusion that China would fail and decoupling along with economic distress would follow. The end of the China Dream would follow and American 5 eyes supremacy would prevail, something usually mistakenly called "Western".
The problem with these think tanks is their inherent bias and ethnocentric racism. Yet, despite the restrictions, the suppression, the pseudo intellectual dismissal of blatant racism coming in the form of "I hate the CCP but I love the Chinese people", "Asians cannot really think", "China lies, steals and cheats" type talk, the fact of the matter is, even if China successfully creates a fully domestic semiconductor supply chain, the sanctions game and demonization will never stop until China successfully overpowers the Americans.