@kuali Also important to note that it goes both ways. This guy was skeptical about it working in actual conditions, and would never allow a guy to sales-talk him into buying them until his concerns were addressed. But all the other people were managers that didn't care about the technical details, so an engineer like Sato would struggle to get them to care about the product; she can tell them about the specs all day, but their lack of expertise prevents them from understanding how impressive the product is.
I'm sure there are engineers that can talk sales, but she's not one of them. Salesmen can have technical expertise as well, and this guy seems to have learned how to answer that particular line of questioning, but he'll never be able to know everything that the developer does.