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> far less performant code than the one before it.

That worked because of rapid advancements in CPU performance. We’ve left that era.

It’s about more than performance. Code is and always has been a liability. Even with agents, you start seeing massive slowdowns with code base size.

It’s why I can nearly one shot a simple game for my kid in 20 minutes with Claude, but using it at work on our massive legacy codebase is only marginally faster than doing it by hand.

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You asked why the size of the code matters, I gave you the answer. If you want to ramble about the non technical aspects of software development talk to someone else, I'm not interested.
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I asked a rhetorical question to get the reader to think about a topic. I was not looking for a rote recitation of a well-known textbook answer. Maybe you should not be on the comment section of an engineering website if you find discussion so offensive.
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