In this kind of structure, what role does managers fill? It sounds like ICs can manage themselves, and the project manager manages the project... What's left for managers to do?
Manage bureaucracy around people: leave, hiring, firing, and promoting. They also generally need to be involved in things that may be more project management depending on the authority project mangers have in organizations: procuring new tools, updating senior management, escalation for cross team issues/communication, filter out noise from external forces, etc.
