Managers have to manage up, down and outward. Most ICs will generally see downward management, but not the hours put in reporting up to executives, aligning and planning initiatives, resource/ allocations/PI’s, budgeting, procurement, audits, client/product demos/presentations, hiring and sometimes firing.
Managing down tends to be the easy part, career planning, 1:1’s, performance/development and running rituals is a cake walk. The only real hard part of managing down is when you have an employee that’s poisoning the well or is on a PIP.
Oh, and some managers also have to still pick up cards and push code in some orgs.