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The 80% Problem: The Last 20% Is Where the Engineer Used to Live

Hacker News · Jun 29, 2026, 6:35 PM · Also reported by 2 other sources

Key takeaways

  • The trouble is what the missing fifth contains, the edge cases and operational reality that used to teach engineers their judgment, and who builds that muscle now.
  • AI gets you to a working draft fast (say four-fifths of the way), and the speed is real.
  • At the end of the last post I admitted there was a related ache I was leaving for its own post: the way the tool gets you to eighty percent in a hurry, and the last twenty was always where the engineer actually lived.

AI gets you to a working draft fast. The trouble is what the missing fifth contains, the edge cases and operational reality that used to teach engineers their judgment, and who builds that muscle now.

AI gets you to a working draft fast (say four-fifths of the way), and the speed is real. The trouble is what the remaining fifth contains, and who used to build the muscle that handles it.

At the end of the last post I admitted there was a related ache I was leaving for its own post: the way the tool gets you to eighty percent in a hurry, and the last twenty was always where the engineer actually lived. This is that post.

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