Comac is the opposite of quality and the iPhone quality is so high because Apple is able to set and hold their high western qa standards. A domestic industry would have to struggle with the supply can taking shortcuts at every level and that’s much harder of a task. That’s why Chinese concrete is often poor quality, it could be higher quality they know how to make it at high quality levels but it isn’t due to rampant cheating.
Comac is also quite instructive.