Every tool works in the demo. That's what the demo is for.
The sample data is clean and the use case was picked because it shows well. It proves the thing can work, under conditions you won't run it in.
Production is different. Your data is messier than the sample, and there's usually an integration or a residency rule nobody mentioned.
Run proofs of concept, but make them test the thing most likely to break it here, on your own data. Not the thing most likely to look good.
"Can this work?" and "will it work for us?" are different questions. The demo only answers the first.