Why spreadsheet what-ifs are broken.
Spreadsheet scenarios pull from a stale CSV, model demand on yesterday's forecast, skip the constraint engine, and produce numbers that don't reconcile to the live dashboard. The owner asks a follow-up question Tuesday and the math has shifted - because the underlying data shifted and the spreadsheet didn't.
The simulator runs against the live spine. Same forecast, same constraint engine, same comp set state as the production pricing engine. The math you see is the math the action engine would use.