Even if a computer could model all the narrowly economic problems a company faces (and, to be clear, none can), it wouldn’t be enough. To model all costs, it would have to model human irrationalities, emotions, feelings, and interactions. Computers help, but we still don’t have all the info. And if we did, we wouldn’t know what to do with it. So, in practice, we end up having companies of a certain size.
To pose a simple question, how many other people are there in the world you would rather listen to? Does that not mean Peter is one of the seminal public intellectuals of our time, albeit working through some non-traditional media of communications?