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It's also about manufacturing tolerance, making room for error, suffering environmental stuff and understanding that the universe is out to get you. Sure, in reductio ad absurdum it's all just physics, but most of shipping a product is making engineering tradeoffs, dealing with complex stuff you may not fully understand, and making plans for when vendor B's product isn't exactly the same as vendor A's chips, but vendor A was just bought by Apple and won't talk to you any more, at any price. :-)

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