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This is aside from the other key "software brain" problems of Codex and Code: dividing all work into front-end and back-end design, solving for the general case in a repeatable way, not testing or exploring idea spaces, testing for technical correctness but not other aspects...↗

·@emollick·Jun 21, 2026·essay·code·codex·software-design·testing

Why on earth would you want to revert to Spec-Driven Development? Yes, agents are way faster at writing code. And (some) humans are better at system thinking. But we also suck at planning. Any experienced engineer knows you simply cannot sit down, write the specs and then write…↗