Feature-complete demos run only on data the vendor has already cleaned and constrained. That filtering step turns every capability claim into a performance that evaporates once the buyer's actual records arrive.
Procurement teams accept the walkthrough because every required field matches the contract spec. The product never encounters duplicate keys, partial timestamps, or the malformed encodings that appear in the first real batch.
Build teams that ship internal products face the opposite pressure. They must keep the system alive across every nightly feed variation or the next release gets blocked. The craft shows up in the handling code, not the slide deck.
When an organisation chooses buy, the contract rarely prices the post-purchase work of restoring those missing guards. The vendor moves to the next prospect while the buyer inherits the repair backlog.
A credible product proof therefore demands the vendor process an unedited extract under load for at least one full cycle. Any manual cleanup or selective omission during that test disqualifies the result.
Strategy decks avoid this test entirely. They list features and roadmaps without ever requiring the product to survive the next data anomaly that will inevitably appear.
Teams that insist on the live extract test quickly learn which vendors have invested in resilient handling and which have only invested in the demo script.