Diagnostic essay
Every platform selection I have watched fail followed the same sequence, and it never started with a bad vendor. It started with a good demo.
Leadership gathers in a room. A sales engineer runs a scripted walkthrough with clean data, an idealized workflow, and none of the edge cases that define daily operations. It looks effortless. Someone in the room concludes that this is the solution, and the decision is effectively made before requirements gathering has even begun. What follows, the RFP, the evaluation matrix, the stakeholder interviews, becomes a formality constructed to justify a conclusion the room already reached.
The issue is not that the demo was misleading. It is that a demo answers a narrow question: can this software perform the task. It does not answer the question that actually determines success: does this match how the organization's people do their work today. Those are two different questions, and only one of them predicts whether an implementation holds up once it leaves the sales floor. I have seen the right platform for an organization get passed over because a competitor's demo looked more polished in the room. I have also seen the reverse, where the more impressive demo won procurement, and months later the organization was operating the new system through manual workarounds because no one had verified it against how the work actually happened before the contract was signed.
The solution is not to eliminate demos from the process. It is to sequence them correctly. Requirements, built from how work is genuinely performed rather than how leadership hopes it will be performed, need to exist before anyone sits down for a vendor demonstration. Not as a formality applied retroactively to support a decision already made, but as the standard the demonstration is measured against. A demo evaluated against defined requirements is due diligence. A demo evaluated against a strong impression in the room is a decision made on instinct and presented afterward as analysis.