This strikes me as the answer, too, especially with the PowerPoint example in mind. Working with somebody who is only an expert at communication to get them to

This strikes me as the answer, too, especially with the PowerPoint example in mind. Working with somebody who is only an expert at communication to get them to communicate on your behalf about a topic you're expert on requires a lot of laborious back and forth, which reduces quality because the subject matter expert spends most of their time trying to make sure that the composer's "improvements" don't accidentally mean something opposite or orthogonal to what is intended. If a manager and a PowerPoint design expert worked together at the same computer, with the manager dictating content and the PowerPoint expert performing the edits and suggesting design improvements, you would get a better end product, but I doubt it would amount to a productivity gain.