Assuming we get to AGI and companies are willing to employ them in lieu of a human employee, why would they stop at only replacing small pieces of the org rathe

Assuming we get to AGI and companies are willing to employ them in lieu of a human employee, why would they stop at only replacing small pieces of the org rather than replacing it entirely with AGI? AGI, by most definitions at least, would be better than most people at most things. Especially if you take OpenAI's definition, which boils it down only to economic value, a company would seemingly always be better off replacing everything with AGI. Maybe more likely. AGI would just create superior businesses from scratch and put human companies out if business.