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It all still works so the moving parts must all be OK, but I don't agree that build quailty refers only to moving parts. Features such as a magnesium alloy shell, or weather proof sealing are both aspects of build quality, and design of electronics which mean that a flash will work for as long as the life of the camera without the bulb or circuit burning out.
Electronics are notorius for being damaged in even small drop tests (phones are normally tested for a 1Metre drop onto concrete). The fact that the circuitry stood up to the impact is also testament to the build quailty.
Build quailty in this case is also about things moving when they're not supposed to normally!
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