Truth. All the hand wringing about China's equipment fails to address two issues IMO:
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Chinese literally do not have a culture of manufacturing perfection, on the system level required to field a reliable product like a military plane. They will eventually get there, which takes a long time.
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Chinese to not have the operational experience in supply chain and mission readiness, and all of the million steps involved in the concept of 'kill chain'. Everything has to work right to get that missile on the target, and there are a shit ton of opportunities for failure.