you underestimate the effort in having your own complete semiconductor chain. It is greater than to manufacture jet engines.
Just think about this. The US can manufacture jet engines with 100% US made equipment and supplies. But it cannot manufacture chips with 100% US made equipment and supplies.
Only time will tell but the distinction I am pointing out is precisely that China has/had no aviation market/supply chain whereas that is completely the opposite for semiconductors, the market, industry champions and talent/expertise is all there already.
Furthermore, you are missing the most important part. The US/west also completely overlooked the importance of semiconductors and AI, because guess what, they can't tell the future better than any one else despite being leaders in R&D. China is on a more equal footing that you are giving them credit for. The sanctions is simply policy playing catch-up; and it is in all likelihood too little too late because as I said the ecosystem has already been established in China and greater degree Asia.