Engineering costs and money in your wallet
Sometimes non-engineers say things like, "If an engineer did this, wouldn't that be the overall optimization?" or something like that. How this looks to an engineer is like "I have a 10,000 yen bill in your wallet, let's all go see a movie together, everyone is happy to see a movie, so it's overall optimal".
That's not total optimization.
The reason why such a misunderstanding occurs is because engineers misinterpret their "time" as if it were a free resource!
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