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Not 'literally every' one - ""I'd like to order 4,000 lattes to go, please."

[1] https://www.theverge.com/2013/3/4/4063272/meet-starbucks-bar...

Although for a product like this, having it work in less than ideal conditions is showcasing their product in the best possible light. I'd agree with you if they were doing a live demo.

Not every company announces a scripted (read: fake) conversation with something to the effect of "this is a real conversation".

Actually it seems like the iPhone demos are pretty natural. The last one Craig had an issue with unlocking using faceid so he had to switch to a backup. Seems pretty authentic to me.