He doesn't necessarily miss the value of managers, in fact he says that he has managers, just not one person who's sole role is a manager, they rotate every week.

When you mention technical workers being suspicious of managers and managers believing that there job is more difficult than technical work, you're talking about the exact situation that Jason mentions trying to avoid. One way of being less suspicious of the value of someone is to do the work that they do. That's what he's talking about.