Explain why an AGI is needed? Because to me, invoking the need for an AGI sounds equivalent to saying you don't understand the problem space.
Hire people, fire people, pitch investors, manage direct reports across multiple business lines, understand what's going on in the world and market, set a product vision/direction, shape the culture of the org, etc etc. That's AGI territory.
We may be able to formulate our current understanding of what it takes to be a CEO in every feasible future context that we can imagine, and create an agent (not an AGI) that does that.
But then what would happen when the distributions change out of sample in an unforseeable way? Suppose two countries go to war and this drastically changes the operating environment of the business. The agent would need to learn how to operate with human-level capability in this novel environment which it wasn't trained specifically to do. That's why I'm thinking it requires an AGI.