It's not just about the CPUs or APUs, which generally have very high yield and long lifetimes. It's all the other chips. SSD begins exhibiting errors after extensive use. Other chips that are considered good enough are at the high end of their acceptable performance tolerances when they are included in devices, but the effects are additive. So the more chips running at the high or low end of what is considered acceptable, the more likely that problems will crop up over time.
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