I think the difference is significant. If he says it's an "unexplained reference" to unreliability he would be saying "everybody knows the machines are great, I

I think the difference is significant. If he says it's an "unexplained reference" to unreliability he would be saying "everybody knows the machines are great, I don't understand why the heck the journo brought up unreliability when they had a trouble free transaction", which would be pretty living-in-a-bubble. Talking about an "unexamined expectation", on the other hand, is "I know that many people approach vending machines assuming they all suck and a malfunction is a likely outcome, but in the industry we think this isn't a correct view of modern machines and it would be nice if people updated their priors". '100 times cautious' seems to me a pretty good example of an unexamined expectation...