The point of the fallacy is that you don't know what value they bring or when they bring it.

Real estate agents are a good example. They might be the only people involved aware of the processes everyone's engaged in and moving things forward. Having helped build tools for a local shop I can tell you that their checklists and flowcharts can't and won't be built with AI because hoarding and sharing information has always been part of their competitive advantage.

A corollary might be that the value of human involvement is unknowable because human beings aren't rational. The Doorman is a buffer against chaos.