True client story, heavily anonymised: I was representing my client at a meeting with a third party with which they were planning to integrate. Financial systems and many zeroes were involved.

It became apparent early in the call that although we were talking in some detail about integrating two complex and complicated systems, no-one on the call was a developer (except myself, lapsed).

It had never occurred to me that the powers that be might do that. Next time (and from then on) there were developers involved, at least from our side.