One of the most useful functions of a good manager is to act as a shield for their team from upper management firestorms. That's a role that I think AI is particularly unsuited for, given their tendency to be obsequious.

As a more general role, the idea of responsibility is that the manager has the job of making sure that individual employees' tasks are suited both to their individual competence and abilities and to the corporation's deliverables and ultimate bottom line. This requires making arguments in both directions: in pulling employees to working on things more useful to the company, and in changing the deliverables to capitalize on employees' abilities.