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80% mark means you just finished the happy flow and written 30% of the code bases. Now you need to handle the unhappy parts and need to write extra test code for covering all those edge cases.

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Precisely, now you need to finish off the remaining 70%, which is where most of the work that is required truly lies, with or without all the AI bollocks. Whether it takes 2 or 8 days of work to get those 30% done, it's not much of a difference if you need several months(or in some cases years) to get a project to a tolerable "production" state. I'd much rather spend 8, as opposed to an AI-generated codebase which will shoot itself in the head because someone scrolled over it and thought "lgtm".

The alternative to using AI to generate 80% of the project (30% of the code) isn't much better: coding the initial 30%, which is also a challenge (from 0 to 1).

So there is still a productivity gain for senior developers.

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