Lessons from production.

Not only success stories. Each note follows: problem → what happened → why → what changed → what I’d do differently.

Similarity looked smart until latency and ambiguity showed up mid-client-call.

Extraction alone still leaves desks retyping structure — and worse, false confidence.

Horizontal tools force practitioners to reorganize around the software.

Elegant cutovers hide failure modes; desk-aligned slices survive.