The failure mode split nobody's naming: Claude gets regexes right about 95% of the time, which is annoying but catchable. Gets auth logic or state management right 95% of the time and you've got silent data corruption showing up 3 months later on an edge case nobody tested.

Vibe coders treating those as the same category is what actually worries me. Even in regular software there's a feedback mechanism - unit tests go red, CI breaks. Vibe coding skips that too. You get working code that passes the happy path and nothing that tells you which 5% failure rate is the dangerous one. That judgment about problem category severity is the thing that's hard to develop without breaking things first.