In many senses there's hubris in the western* view of China accomplishments: most of what western companies have created has had significant contribution by Chinese scientists or manufacturing, without which those companies would have nothing. If you look at the names of AI researchers there's a strong pattern even if some are currently plying their trade in the west.
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* I hate the term "western" because some "westeners" use it to separated what they think are "civilized" from "uncivilized", hence for them LATAM is not "western" even though everything about LATAM countries is western.
It's worked for a very long time for aircraft.
China has been pushing to build its own aircraft for >23 years. It took 14 years for COMAC to get its first regional jet flying commercial flights on a Chinese airline, and 21 years to get a narrow-body plane flying a commercial flight on a Chinese airline.
If for no technical reasons and purely political, COMAC may still be decades away from being able to fly to most of the world.
Likewise, in ~5 years, China may be able to build Chips that are as good as Nvidia after Nvidia's 90% profit margin - i.e. they are 1/10th as good for the price - but since they can buy them for cost - they're they same price for performance and good enough.
If for purely political reasons, China may never be able to export these chips to most of the world - which limits their scale - which makes it harder to make them cost effective compared to Western chips.
See what I did there?
If you compromise on safety, you get something that is still suitable for the military. If you don't care about economics you can participate in the space race.
But for commercial air travel, you don't have the luxury to pick just two; a competitive commercial airliner has to perform exceedingly well in all three regards.
If you're an airline using expensive aircraft you will go bankrupt. If your aircraft is too slow then your competitors will eat your lunch, and if you have a reputation of being unsafe then your customers will run away or the government will pull the plug (likely both).
IMHO affordable commercial air travel is one of the biggest marvels of 20th century engineering.
This doesn't matter so much for military purposes: they can easily eat the cost of a higher maintenance and replacement schedule on a smaller number of military jets with fewer hours on them.
This gives them more iteration cycles, speeding their building up of experience. They're catching up. Industrial espionage will help them along too, but not as much as the experience from engineering their own designs.
Sigh, the OP chucked out a casual insult at the Chinese because - unlike the USA and EU - their society is unable to (to date) build an international airliner business.
I deftly pointed out that the USA - despite is historical achievements - cannot build a high speed rail network and industry.
Once cannot cherry-pick the data one likes.